What Actually Happens After You Eat?

Most nutrition advice begins at the wrong level.

Eat more protein.

Eat vegetables.

Avoid too much sugar.

Drink water.

Get enough vitamins.

All of that can be useful, but it skips the more interesting question:

What is the body actually doing with the food?

If I eat a bowl containing rice, dal, vegetables, curd and nuts, those foods don't somehow travel directly into my muscles.

They are mechanically broken apart.

Chemically dismantled.

Absorbed through the intestine.

Transported through the bloodstream.

Processed by the liver.

Stored, converted, burned, incorporated into tissues or eventually removed as waste.

Nutrition makes much more sense when you stop thinking about foods as "healthy" or "unhealthy" objects and start thinking about the human body as a gigantic biochemical processing system.

The major nutrient classes are carbohydrates, fats, proteins, vitamins, minerals and water. Carbohydrates, proteins and fats are the main energy-yielding macronutrients, while micronutrients participate in an enormous number of regulatory and biochemical processes.

So let's follow the process from beginning to end.

Step 1: You Eat Something

Imagine I eat:

• rice
• dal
• paneer
• vegetables
• curd
• a handful of nuts

To me, that's one meal.

To my body, it's a mixture of completely different molecules.

The rice contains a lot of carbohydrate.

Dal contains carbohydrate, protein, fibre and micronutrients.

Paneer contributes protein and fat.

Nuts contain fats, protein, fibre and minerals.

Vegetables provide carbohydrates, fibre, vitamins, minerals and thousands of other compounds.

Curd contributes protein, carbohydrate, minerals and microorganisms depending on how it was produced.

Your digestive system has to somehow separate this mess into molecules small enough to absorb.

That's where digestion begins.

The Mouth: Digestion Starts Before the Stomach

The first processing stage is mechanical.

You chew.

Your teeth break food into smaller pieces.

That sounds trivial, but surface area matters enormously.

If I drop one giant sugar cube into water, it dissolves relatively slowly.

Crush that same cube into powder and much more of it is exposed to water simultaneously.

Chewing does something similar.

It increases the surface area available to digestive enzymes.

Meanwhile, your salivary glands release saliva.

Saliva lubricates the food so that you can swallow it, but it also begins chemical digestion.

One important enzyme in saliva is amylase, which begins breaking some starch molecules into smaller carbohydrate molecules.

So carbohydrate digestion has already started before the food even reaches your stomach.

You chew.

The tongue forms the food into a manageable mass called a bolus.

Then you swallow it.

The Esophagus: Transportation

The food enters the esophagus.

You're not simply relying on gravity.

Muscular contractions called peristalsis push the food downward toward the stomach.

This is a recurring pattern throughout digestion.

Your digestive tract isn't just a hollow pipe.

It is active tissue.

Muscles move material.

Hormones communicate.

Nerves regulate activity.

Cells secrete enzymes.

Microorganisms metabolize compounds.

Blood vessels collect absorbed nutrients.

The digestive tract is essentially an enormous biological processing plant.

The Stomach: Acid, Enzymes and Mixing

Food reaches the stomach.

Now things become much more chemically aggressive.

The stomach secretes acid and digestive substances and mechanically churns the food.

One important consequence of the acidic environment is that proteins begin losing some of their complex folded structure.

This helps digestive enzymes access them.

An enzyme called pepsin participates in breaking proteins into smaller peptide fragments.

So imagine the paneer protein.

Originally it consists of long chains of amino acids folded into complicated shapes.

Digestion gradually dismantles those structures.

Large proteins become smaller peptides.

Eventually, further down the digestive tract, many of those peptides are reduced into amino acids small enough to absorb.

The stomach mixes everything into a semi-liquid material called chyme.

Then, gradually, the stomach releases this material into the small intestine.

The Small Intestine: Where Most Absorption Happens

This is where digestion becomes especially sophisticated.

The small intestine is the primary location where many nutrients are digested further and absorbed into the body.

Three major organs become important here:

the pancreas

the liver

the gallbladder

The pancreas releases digestive enzymes.

The liver produces bile.

The gallbladder stores and releases bile.

Together, these systems help dismantle carbohydrates, proteins and fats into forms the intestinal wall can absorb.

What Happens to Carbohydrates?

Let's start with the rice.

Most digestible carbohydrate eventually needs to be broken down into simple sugars before absorption.

One particularly important result is glucose.

Carbohydrates are a major energy source, and glucose can be used by cells to support energy metabolism.

So very roughly:

rice starch

↓

smaller carbohydrate molecules

↓

simple sugars

↓

absorption through the intestine

↓

bloodstream

But now we have a problem.

The bloodstream is not supposed to contain unlimited amounts of glucose.

The body therefore regulates glucose availability carefully.

Insulin: The Traffic Signal

After a carbohydrate-containing meal, blood glucose often rises.

The pancreas can respond by releasing insulin.

Insulin is sometimes described simply as "the fat-storage hormone," but that is an oversimplification.

It participates in coordinating nutrient handling.

Among other effects, insulin helps various tissues take up and store nutrients and signals that energy is currently available.

Muscle cells can take up glucose.

The liver can take up glucose.

Glucose can be burned for energy.

Or stored.

One major storage form is glycogen.

Glycogen: Your Carbohydrate Storage Tank

Humans don't store large bags of rice inside themselves.

We chemically convert glucose into glycogen.

Glycogen is stored mainly in the liver and skeletal muscles.

Think of it as a rapidly accessible carbohydrate reserve.

Muscle glycogen is particularly useful during muscular activity.

Liver glycogen contributes to maintaining blood glucose availability between meals.

Suppose you train legs later.

Your muscles suddenly need significantly more energy.

Stored glycogen can be broken back down and used in energy-producing pathways.

So yesterday's rice can indirectly help power today's squat.

That's much more interesting than saying:

"Carbs give energy."

There is an entire storage and retrieval system underneath that sentence.

What Happens If Glycogen Stores Are Already Sufficient?

Your body has several possibilities.

Glucose can continue being oxidized for energy.

It can replace previously used glycogen.

Other metabolic pathways can process the excess depending on the body's current energy state.

Over long periods, if total energy intake consistently exceeds total energy expenditure, the excess energy can contribute to increased body-energy stores, especially body fat.

This is why calories still matter.

The biochemical pathways are complicated, but the long-term constraint is remarkably simple:

energy cannot disappear.

What Is a Calorie Actually Measuring?

A dietary calorie is a unit of energy.

When someone says:

"This contains 500 calories,"

they are essentially describing how much usable chemical energy is associated with that food.

The commonly used approximate energy values are:

Protein: ~4 kcal per gram

Carbohydrate: ~4 kcal per gram

Fat: ~9 kcal per gram

Alcohol also provides energy, though it isn't an essential nutrient.

Fat is therefore much more energy-dense than carbohydrate or protein.

Ten grams of fat contains roughly 90 kcal.

Ten grams of carbohydrate provides roughly 40 kcal.

This doesn't make fat "bad."

It means fat is concentrated energy.

What Happens to Protein?

Now let's follow the paneer and dal protein.

Proteins are enormous biological molecules.

Your body can't simply absorb an intact paneer protein and attach it to your biceps.

It has to dismantle it.

Protein digestion produces smaller peptides and eventually amino acids.

Those amino acids cross the intestinal wall and enter circulation.

Now the body has raw materials.

And amino acids are extraordinarily useful.

Your body uses amino acids to build:

muscle proteins

enzymes

transport proteins

some hormones

structural proteins

components involved in immunity

and countless other molecules.

Dietary protein increases the availability of amino acids and supports protein synthesis and whole-body protein balance.

This is why protein is not merely "muscle food."

Every cell depends on proteins.

Muscle Is Constantly Being Built and Broken Down

Your muscles are not static chunks of tissue.

Proteins within them are continuously being synthesized and degraded.

Think of two competing processes:

Muscle Protein Synthesis

and

Muscle Protein Breakdown

If, over time, synthesis exceeds breakdown, muscle tissue can accumulate.

If the reverse dominates, muscle can be lost.

Resistance training changes the environment.

You place mechanical tension on muscle tissue.

That produces signals that increase the body's drive to repair and adapt.

Now supplying enough amino acids gives the body the materials required to perform that remodeling.

This is why:

training + protein + sufficient energy + recovery

makes more sense than:

protein = muscle

ACSM similarly emphasizes that muscle gain depends on resistance training, adequate energy, nutrient availability, protein and carbohydrate intake, and recovery rather than protein alone.

What Happens After a Workout?

Suppose I train chest.

I perform progressively difficult resistance exercises.

The muscle experiences mechanical loading.

This activates signaling pathways associated with adaptation.

For some time after training, the muscle becomes more responsive to protein intake.

I eat protein.

The digestive system breaks it into amino acids.

Those amino acids enter circulation.

Muscle tissue can take them up.

The body uses them to support synthesis and repair.

Repeated many times:

training stimulus

↓

recovery

↓

adaptation

↓

slightly greater capacity

Then I expose the body to a slightly greater challenge.

This is progressive overload viewed biologically.

Protein Isn't Stored Like Carbohydrate or Fat

This is another useful distinction.

The body maintains large fat stores.

It maintains glycogen stores.

But there isn't a giant dedicated "protein tank."

Amino acids circulate and participate in a dynamic body protein pool, but excess dietary amino acids don't simply accumulate indefinitely waiting for your next workout.

Their nitrogen-containing components can be removed.

The remaining carbon structures can enter metabolic pathways and ultimately contribute to energy production or other molecules.

Nitrogenous waste is eventually processed, much of it into urea, and removed through the kidneys.

So eating 500 grams of protein doesn't magically give five times the muscle-building effect of 100 grams.

Biology has bottlenecks.

What Happens to Fat?

Dietary fat follows another route.

Fats are poorly soluble in water.

That's inconvenient because much of digestion occurs in a watery environment.

Bile helps solve this problem.

Bile helps disperse fat into much smaller droplets.

This dramatically increases the surface area available to digestive enzymes.

Enzymes such as pancreatic lipase then help break triglycerides into components that can be absorbed.

Inside intestinal cells, these components can be packaged into transport particles.

Many dietary fats initially travel through the lymphatic system before entering circulation.

Eventually fatty acids can be:

burned for energy

used in cellular structures

used to produce signaling molecules

or stored in adipose tissue.

Body Fat Is an Energy Storage System

People often talk about body fat as if it were useless material attached to the body.

It isn't.

Adipose tissue is an energy-storage system.

A human could not practically store enormous amounts of energy as glycogen.

Fat is much more energy dense.

That makes it useful for long-term storage.

When energy availability becomes insufficient, stored triglycerides can be broken down.

Fatty acids enter circulation.

Cells can oxidize them and use the released energy.

So the fat on someone's abdomen is not simply "extra weight."

It is chemically stored energy.

The problem arises when excessive accumulation contributes to metabolic dysfunction and disease risk.

Why Losing Fat Requires an Energy Deficit

Suppose your body needs:

2,400 kcal/day

to support everything happening that day.

But you eat:

2,000 kcal/day

There is now an energy gap.

Your body cannot simply decide not to obey physics.

The missing energy has to come from somewhere.

Some comes from stored glycogen.

Some comes from stored fat.

Some can come from protein and other substrates depending on circumstances.

Over enough time, maintaining an energy deficit generally reduces body-energy stores.

That's the underlying logic of fat loss.

Not:

carbs are evil.

Not:

insulin prevents weight loss.

Not:

never eat after 8 PM.

It's fundamentally an energy-management problem.

Food composition still matters enormously because it affects satiety, performance, health, muscle retention, digestion and how easy the diet is to sustain.

But energy balance remains underneath everything.

Why Resistance Training Matters During Fat Loss

Imagine losing 10 kg.

You probably don't want that to mean:

5 kg fat

5 kg muscle.

You would usually prefer as much as possible to come from fat while preserving muscle.

Resistance training gives the body a reason to maintain muscle.

Adequate protein gives it building materials.

A reasonable rather than extreme calorie deficit makes recovery easier.

Sleep helps support the entire process.

So a good fat-loss strategy isn't merely:

eat less

It's closer to:

create a manageable energy deficit while strongly signaling that muscle remains useful.

What Are Micronutrients Doing?

Macronutrients get most of the attention because we measure them in grams.

Protein.

Carbs.

Fat.

But vitamins and minerals are essential participants in countless biochemical reactions.

For example:

iron participates in oxygen transport

calcium participates in bone structure and cellular signaling

sodium and potassium contribute to electrical gradients and nerve/muscle function

magnesium participates in many enzyme reactions

iodine is required for thyroid hormone production

vitamin B12 participates in neurological and blood-cell processes

vitamin D has roles in bone and other physiological systems

vitamin C participates in collagen synthesis and other processes

These molecules don't necessarily provide energy themselves.

Instead, many help the machinery that processes energy function correctly.

It's like having fuel but missing components required for the engine.

This Is Why Eating Only Protein Powder Would Be a Terrible Diet

You could theoretically obtain lots of protein.

But health requires much more than hitting a single macro target.

You need essential fatty acids.

Vitamins.

Minerals.

Fibre.

Water.

Adequate energy.

And a diet diverse enough to supply the compounds required for normal physiology.

This is one reason health authorities continue recommending diets built around a variety of minimally processed foods including vegetables, fruits, legumes, whole grains and nuts while limiting excess free sugars, sodium and harmful fat patterns.

Fibre Is Weird Because You Don't Fully Digest It

Humans cannot digest many forms of dietary fibre in the same way we digest starch.

That doesn't make fibre useless.

Some fibre adds bulk and influences stool movement.

Some can be fermented by microorganisms in the colon.

Those microorganisms produce compounds that can interact with the gut and the rest of the body.

So part of what you eat isn't really feeding you directly.

It feeds an ecosystem living inside you.

You Are Carrying Around a Microbial Ecosystem

Your digestive tract contains enormous populations of microorganisms.

Collectively, these communities are called the gut microbiota.

They interact with food components that escape digestion earlier in the gastrointestinal tract.

They can metabolize fibres and other substances.

Their metabolic products can then interact with human physiology.

Research increasingly shows that the gut ecosystem participates in nutrient metabolism, bile-acid processing and other physiological functions.

This doesn't mean every probiotic advertisement is correct.

The microbiome is complex and the science is still developing.

But the basic idea is remarkable:

A human is not operating entirely alone.

We're ecosystems.

What Happens to Water?

Water doesn't provide calories.

Yet you would die much faster without water than without food.

Why?

Because biology happens in water.

Blood plasma is largely water.

Chemical reactions occur in aqueous environments.

Water helps transport substances.

It participates in temperature regulation.

It contributes to blood volume.

Your kidneys require it to eliminate waste.

Sweating allows heat to leave the body.

When you train, particularly in heat, fluid and electrolyte losses can become substantial enough to affect performance and health.

So hydration isn't about forcing yourself to drink some magical universal number of litres every day.

Needs change with:

body size

temperature

humidity

physical activity

diet

sweat rate

and individual physiology.

What Happens When You Sweat?

Sweating is essentially an evaporative cooling system.

Your muscles generate heat during exercise.

If body temperature rises too far, that's dangerous.

Sweat glands release fluid onto the skin.

When water evaporates, heat is carried away.

But sweat doesn't contain only water.

It also contains electrolytes, particularly sodium.

This is why long or extremely sweaty exercise can sometimes require more than plain water.

Again, the body looks remarkably like an engineered system:

temperature sensor

↓

control system

↓

cooling mechanism

↓

fluid loss

↓

replacement requirement

Your Heart Is the Distribution Network

Digestion would be useless without transport.

After nutrients enter the body, the cardiovascular system helps distribute them.

The heart continuously generates pressure.

Blood flows through arteries.

Smaller vessels distribute blood into tissues.

Capillaries create enormous surface area for exchange.

Cells receive:

oxygen

glucose

amino acids

fatty acids

hormones

electrolytes

and other substances.

Waste products move in the opposite direction.

Carbon dioxide eventually reaches the lungs.

Other metabolic waste is processed through organs such as the liver and kidneys.

Nutrition therefore cannot really be separated from cardiovascular health.

The delivery system matters as much as the fuel.

Oxygen Is Part of Nutrition Too, in a Strange Way

We normally separate breathing and eating.

But from an energy perspective they eventually converge.

You eat molecules containing stored chemical energy.

You breathe oxygen.

Inside cells, metabolic pathways use these inputs to produce usable cellular energy.

A key molecule produced is ATP.

ATP is sometimes described as the energy currency of the cell.

Muscle contraction requires ATP.

Maintaining ion gradients requires ATP.

Building molecules requires energy.

Cellular maintenance requires energy.

You are constantly producing and consuming ATP.

ATP Is What Your Muscles Actually Spend

Your biceps don't literally run on paneer.

They run on ATP.

Food helps provide the substrates required to regenerate ATP.

During extremely short, explosive activity, your muscles rely heavily on immediately available ATP and phosphocreatine.

As activity continues, carbohydrate metabolism contributes substantially.

During longer periods and lower intensities, fat oxidation becomes increasingly important, though energy systems always overlap.

So:

food

↓

digestion

↓

nutrients

↓

metabolic pathways

↓

ATP

↓

muscle contraction

This is the real path from breakfast to bench press.

Your Liver Is the Metabolic Logistics Center

If I had to compare one organ to a logistics hub, the liver would be a strong candidate.

It receives nutrient-rich blood from the digestive tract.

It stores glycogen.

It participates in maintaining blood glucose.

It processes amino acids.

It synthesizes many proteins.

It participates in lipid metabolism.

It processes various drugs and compounds.

It produces bile.

It transforms substances into forms the body can use or eliminate.

It is less like a single-purpose organ and more like an enormous chemical-processing facility.

Your Kidneys Are Constantly Filtering the Internal Environment

Blood flows through the kidneys.

The kidneys filter enormous quantities of fluid and then selectively reabsorb substances the body wants to keep.

Water balance.

Sodium.

Potassium.

Acid-base balance.

Waste removal.

These are continuously regulated.

Your urine is therefore not simply "water you didn't need."

It's the result of a sophisticated filtering and regulatory system.

Appetite Is Also a Control System

If food is fuel, why don't we simply calculate our required energy perfectly and eat exactly that much?

Because humans weren't designed with calorie-tracking apps.

The body evolved regulatory systems involving the gut, brain, adipose tissue and hormones that influence hunger and satiety.

Stomach distension matters.

Protein affects satiety.

Fibre affects digestion and fullness.

Energy density matters.

Sleep can influence appetite regulation.

Food palatability matters.

Psychology matters.

Environment matters.

Habits matter.

This is why:

"Just eat less"

can be technically correct and practically useless.

The actual problem becomes:

How do I construct an environment and diet where eating the appropriate amount is relatively easy?

Food Quality Matters Even When Calories Are Equal

Imagine two diets both containing 2,000 kcal.

Diet A:

soft drinks

candy

chips

protein powder

Diet B:

fruit

vegetables

lentils

whole grains

dairy

nuts

seeds

appropriate protein sources

Both technically supply energy.

But they are not physiologically equivalent.

The second diet is likely to provide much more fibre, micronutrients and food volume and a very different nutritional profile.

Health is therefore not simply:

calories

And body composition isn't simply:

protein

A better hierarchy is:

1. Energy

Are you eating enough, too little or too much for your goal?

2. Protein

Are you getting enough to support tissue maintenance and your training demands?

3. Fat and carbohydrate

Are you consuming suitable amounts to support health, energy and performance?

4. Micronutrients and fibre

Does your food variety supply the materials required for normal physiology?

5. Meal structure and timing

Can distribution improve performance, recovery, digestion or adherence?

6. Supplements

Only now do the small optimizations become interesting.

Supplements Are Usually the Last 5%, Not the First 95%

People love supplements because they're easy.

Buy powder.

Take capsule.

Feel productive.

But supplements cannot compensate for a terrible foundation.

If someone:

sleeps five hours

barely eats vegetables

doesn't train consistently

gets insufficient protein

eats wildly inconsistent calories

and is chronically dehydrated,

finding the perfect magnesium formulation is probably not the highest-return intervention.

Fix the system before optimizing the accessories.

Health Is More Than Being Lean

A person can look lean and still have poor health habits.

Likewise, body weight alone tells you surprisingly little.

A useful view of health includes:

body composition

cardiovascular fitness

muscular strength

blood pressure

blood lipids

glucose regulation

sleep

diet quality

mobility

bone health

mental health

and long-term disease risk.

The visible body is just one output of a much larger system.

Muscle Is More Than Aesthetics

Muscle is often discussed purely in terms of appearance.

Big shoulders.

Arms.

Abs.

But skeletal muscle is metabolically important tissue.

It allows movement.

It stores glycogen.

It contributes to glucose handling.

It helps maintain physical independence as we age.

Strength training therefore isn't just bodybuilding.

It's investment in functional capacity.

Cardio Isn't Just for Burning Calories

This is another misconception I used to dislike.

People often treat cardio as:

I ate too much, therefore I must run.

That's a very narrow way of seeing it.

Cardiorespiratory exercise trains the system responsible for delivering oxygen and supporting sustained work.

The heart adapts.

Blood-volume and vascular adaptations occur.

Mitochondrial capacity can change.

Your ability to sustain activity improves.

Calorie expenditure is almost a side effect.

A stronger cardiovascular system is valuable even if fat loss is not your goal.

Sleep Is Part of Nutrition

This sounds strange until you think in systems.

Training creates a stimulus.

Food provides materials and energy.

But adaptation requires recovery.

Sleep influences:

cognitive function

training performance

appetite regulation

recovery

hormonal regulation

and many other physiological processes.

You cannot separate sleep from fitness and expect an optimal outcome.

Health isn't a collection of independent checkboxes.

It's an interconnected system.

Why Crash Diets Often Fail

Suppose someone decides:

"I want to lose fat as quickly as physically possible."

So they dramatically cut calories.

Weight falls rapidly.

Great.

Except severe restriction can increase hunger.

Training performance may deteriorate.

Recovery worsens.

Maintaining muscle becomes harder.

The diet becomes socially and psychologically difficult.

Eventually adherence collapses.

The theoretically fastest plan becomes slower because it cannot be sustained.

The best diet therefore isn't necessarily the one with the theoretically perfect nutrient distribution.

It's the one that produces the desired physiological outcome and can actually be repeated for months or years.

Consistency Is a Biological Requirement

One workout doesn't build a muscular body.

One salad doesn't create health.

One bad meal doesn't destroy health.

Biology responds to repeated exposure.

Eat enough protein repeatedly.

Train repeatedly.

Sleep adequately repeatedly.

Walk repeatedly.

Eat vegetables repeatedly.

Manage calorie intake repeatedly.

Your body integrates those signals over time.

Health is essentially a long-running computation.

And every day adds another input.

A Useful Way to Think About the Whole System

You can simplify nutrition into five layers.

Input

Food.

Water.

Oxygen.

Sunlight and environmental inputs.

Processing

Digestion.

Enzymes.

Gut microorganisms.

Liver metabolism.

Hormonal regulation.

Distribution

Blood.

Lymph.

Cellular transport systems.

Utilization

ATP production.

Protein synthesis.

Cellular repair.

Movement.

Neural activity.

Immune function.

Storage and Output

Glycogen.

Body fat.

Structural tissues.

Heat.

Carbon dioxide.

Urine.

Faeces.

Other waste.

Seen this way, nutrition isn't a list of foods.

It's a resource-management problem inside a living machine.

What Does a Good Diet Actually Need to Accomplish?

A good diet should provide enough energy to support your needs without chronically oversupplying it.

It should provide sufficient protein.

It should supply essential fats.

It should provide carbohydrates appropriate to your activity and preferences.

It should contain enough fibre.

It should cover vitamins and minerals.

It should support hydration.

It should be enjoyable enough that you can maintain it.

And ideally it should be built mostly from a variety of nutrient-dense foods rather than requiring constant nutritional micromanagement.

WHO's current dietary guidance similarly emphasizes variety and foods such as vegetables, fruits, legumes, nuts and whole grains while limiting excessive salt, free sugars, saturated fats and industrial trans fats.

The Final Goal Isn't a Perfect Diet

There probably isn't one universally perfect diet.

Humans live in wildly different environments.

We have different cultures.

Different preferences.

Different activity levels.

Different medical conditions.

Different goals.

Different tolerances.

Different budgets.

A bodybuilder and a sedentary elderly person don't have identical nutritional requirements.

Someone running a marathon doesn't eat exactly like someone cutting weight for bodybuilding.

So nutrition shouldn't begin with:

"What is the healthiest food?"

It should begin with:

What does this particular body need to do?

Then construct the inputs around that.

Your Body Is Always Negotiating

The more I learn about nutrition, the less I see the body as a collection of isolated organs.

Everything is negotiating with everything else.

The brain influences appetite.

The gut sends signals to the brain.

The pancreas responds to nutrients.

The liver redistributes them.

Muscle competes for energy.

Adipose tissue stores it.

The lungs bring oxygen.

The heart distributes resources.

The kidneys regulate the internal environment.

The immune system continuously monitors threats.

Your microbiome processes things you couldn't process alone.

Your body is simultaneously:

eating,

digesting,

transporting,

building,

breaking down,

storing,

burning,

repairing,

filtering,

regulating

and adapting.

Every second.

Without you consciously controlling almost any of it.

So when someone says:

"Eat this. It has protein."

There is an entire world hiding behind that sentence.

Food isn't simply becoming part of you.

It is being disassembled, interpreted, redistributed and reconstructed into you.

And perhaps that's the most interesting way to think about nutrition:

You are continuously rebuilding a human body out of things that were not part of you yesterday.