Nutrition

Nutrition is the single biggest lever you have. Training, sleep, and supplementation all matter — but none of them compensate for a broken diet. This post ties together the macronutrient deep dives (protein, fats, carbohydrates) and the digestion process into one unified framework.

Key takeaways

• Calories matter, but source matters more — high-protein diets burn roughly 160–240 extra kcal/day from thermic effect alone; calories are necessary but not the whole picture
• Protein is non-negotiable — the protocol targets 2g/kg goal body weight for adults training regularly, 30–40g per meal, from high-quality animal sources; the only macronutrient your body cannot store for later use
• Fat builds hormones and membranes — saturated for cooking, olive oil daily, omega-3 from fish; fat-soluble vitamins need dietary fat to absorb
• Carbs are strategic fuel — the protocol uses 150–300g/day for active adults depending on training volume, front-loaded to morning/afternoon, from potatoes, rice, oats, fruit; fiber is the most important carbohydrate for long-term health
• Bioavailability varies dramatically — heme iron absorbs 5–10× better than plant iron; alpha-linolenic acid (ALA) barely converts to EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid); cooking and vitamin C improve absorption
• Combining protein + fat + fiber with carbs — associated with 20–50% smaller glucose spikes compared to carbs alone in controlled studies
• Source quality changes nutrient content — wild-caught small fish have dramatically more omega-3 than farmed; pastured eggs have up to 6× more vitamin D than conventional; grass-finished beef has 2–5× more omega-3 and CLA (conjugated linoleic acid) than grain-fed
• Ultra-processed food is the primary enemy — not fat, not carbs, not salt; it’s the industrial formulations that are associated with gut barrier damage, satiety override, and chronic disease

Energy balance — necessary but not the whole picture

Calories determine whether you gain or lose weight. This law of thermodynamics doesn’t break.

• Surplus → weight gain (ideally muscle if training + adequate protein)
• Deficit → weight loss (ideally fat if protein is high + resistance training)
• Maintenance → body recomposition possible if protein and training are optimized

But the source of those calories matters:

• 100 calories from chicken breast don’t behave the same as 100 calories from sugar
• Protein costs 20–30% of its calories just to digest (thermic effect)
• Fat costs 0–3%, carbs 5–10%
• Fiber calories are partially or fully offset by fermentation and SCFA production

This is why high-protein diets have a metabolic advantage — they burn more energy during digestion and preserve muscle, which is itself metabolically active tissue.

The three macronutrients

Each macro has a distinct role. Your body needs all three, but the proportions and sources matter.

Protein — build and repair

Protein provides the amino acid building blocks for muscle, enzymes, hormones, immune cells, and structural tissue. It’s the only macronutrient your body can’t store — you need a steady supply.

Protocol target: 2g per kg of goal body weight per day for adults aiming to build or maintain muscle with resistance training, split across 2–4 meals with at least 30–40g net protein per meal.

Why this target:

• Each meal needs ~30–40g to trigger meaningful muscle protein synthesis (the leucine threshold is ~2.5–3g, which requires roughly this amount of whole protein)
• Spreading intake across meals keeps amino acid levels elevated through the day
• Higher protein increases satiety and thermic effect

Quality matters: digestibility, amino acid completeness, and heavy metal contamination vary widely by source. See the full protein post for net protein utilization (NPU), digestible indispensable amino acid score (DIAAS), and heavy metal data.

Fat — hormones, membranes, and energy

Fat builds cell membranes, insulates nerves, produces hormones (testosterone, estrogen, cortisol), absorbs fat-soluble vitamins, and serves as the primary energy store.

Protocol approach: emphasis on saturated fats for cooking (stable at heat), monounsaturated fat daily (olive oil), and omega-3 from fish + supplementation. Minimize seed oils and eliminate trans fats.

See the full fats post for the omega-6:omega-3 ratio, cooking stability, cholesterol science, and the seed oil debate.

Carbohydrates — fuel and fiber

Carbs are the preferred fuel for high-intensity work. Your muscles and brain run on glucose. Fiber (technically a carbohydrate) feeds gut bacteria and produces short-chain fatty acids (SCFAs) essential for gut barrier integrity.

Protocol approach for active adults: 150–300g/day depending on training volume and calorie budget, front-loaded to morning/afternoon, sourced from potatoes, rice, oats, fruit. Fructose limited to whole fruit (<20g/day men, <15g/day women from non-fruit sources).

See the full carbohydrates post for glycemic index (GI) vs glycemic load (GL), fructose metabolism, resistant starch, fiber types, and carb timing.

Thermic effect of food (TEF)

Your body burns energy just to digest, absorb, and process food. This is called the thermic effect and it varies dramatically by macronutrient:

Macronutrient	Calories per gram	TEF (energy burned in digestion)
Protein	4 kcal	20–30%
Carbohydrates	4 kcal	5–10%
Fat	9 kcal	0–3%

What this means in practice:

• 100 kcal from protein → net ~70–80 kcal after digestion
• 100 kcal from carbs → net ~90–95 kcal
• 100 kcal from fat → net ~97–100 kcal

This is the metabolic advantage of high-protein diets. Eating 200g of protein per day burns roughly 160–240 kcal extra just from digestion — equivalent to 30 minutes of walking.

Micronutrient essentials

Vitamins and minerals don’t provide energy but control nearly every metabolic process. Modern diets commonly fall short in several:

Common deficiencies

Nutrient	How common	Why it matters	Best food sources	Supplement if needed
Vitamin D	~40% of adults insufficient	Hormone-like; activates 3% of the genome	Sunlight, fatty fish, eggs	2,000–4,000 IU/day D3
Magnesium	~50% below RDA	Enzyme cofactor for 600+ reactions; sleep, muscle, nerve	Nuts, dark chocolate, leafy greens	Bisglycinate or threonate
Omega-3 (EPA+DHA)	Most Western diets deficient	Anti-inflammatory; brain, heart, joint health	Fatty fish, algae	2,000+ mg EPA+DHA
Iron	Common in women, vegans	Oxygen transport (hemoglobin)	Red meat (heme iron), liver	Only if tested low — excess iron is toxic
Zinc	~30% globally inadequate	Immune function, testosterone, wound healing	Red meat, oysters, pumpkin seeds	Bisglycinate form
B12	~20% of older adults deficient	Nerve function, red blood cell formation	Animal products only; 0 in plants	Methylcobalamin or cyanocobalamin

Nutrient density — the NRF concept

Not all foods are equal calorie-for-calorie. Nutrient-Rich Food (NRF) scoring measures how many beneficial nutrients a food provides relative to its calorie content.

The NRF index sums 9 positive nutrients (protein, fiber, vitamins A/C/D/E, calcium, iron, potassium) and subtracts 3 negative ones (saturated fat, added sugar, sodium), all normalized per 100 kcal.

High NRF: leafy greens, liver, eggs, salmon, berries, legumes Low NRF: refined grains, sugar-heavy snacks, deep-fried foods, ultra-processed products

This is the concept behind the klatiPRO food database — the NRF score is calculated for every food so you can compare nutrient density across the entire spectrum.

Bioavailability — not all nutrients absorb equally

The amount of a nutrient in food is not the amount your body absorbs. Bioavailability varies by:

Form of the nutrient

Nutrient	High bioavailability	Low bioavailability
Iron	Heme iron (meat, fish) — 15–35% absorbed	Non-heme iron (plants) — 2–20% absorbed
Vitamin A	Retinol (animal foods) — ready to use	Beta-carotene (plants) — 3–6% conversion to retinol
Zinc	Animal sources — high absorption	Plant sources — phytic acid reduces absorption
Calcium	Dairy — ~30% absorbed	Spinach — ~5% absorbed (oxalates bind it)
Omega-3	EPA/DHA from fish — directly usable	ALA (alpha-linolenic acid) from plants — 5–10% converts to EPA, <1% to DHA

What increases absorption

• Vitamin C + non-heme iron: vitamin C can double or triple non-heme iron absorption
• Fat + fat-soluble vitamins: vitamins A, D, E, K absorb 3–10× better with dietary fat
• Fermentation: reduces phytic acid in legumes and grains → better mineral absorption
• Cooking: breaks down cell walls, denatures anti-nutrients → more accessible nutrients
• Adequate stomach acid: essential for iron, B12, calcium, zinc, magnesium absorption

What decreases absorption

• Phytic acid (legumes, grains, nuts) → binds iron, zinc, calcium
• Oxalates (spinach, beet greens) → bind calcium
• Tannins (tea, coffee) → bind iron and protein
• Calcium and iron compete → don’t take calcium supplements with iron-rich meals
• High-dose zinc competes with copper → long-term high zinc without copper → copper deficiency

See the digestion post for the full anti-nutrient table and how preparation reduces them.

Food source quality — not all chicken is the same chicken

Bioavailability tells you how well a nutrient absorbs. But the amount of that nutrient in the food before absorption varies dramatically based on how the animal was raised or the plant was grown. Two chicken breasts can look identical and have very different nutrient profiles.

Wild-caught vs farmed fish

Factor	Wild-caught	Farmed
Omega-3 content	Higher EPA/DHA from natural diet (algae, smaller fish)	Lower omega-3, higher omega-6 from grain/soy feed
Fat profile	Leaner overall; fat is predominantly omega-3	Fattier; fat skews toward omega-6
Contaminants	Varies by species and water — mercury in large predators (tuna, swordfish); low in small species (sardines, anchovies, mackerel)	PCBs (polychlorinated biphenyls) and dioxins can be higher in crowded farm conditions; varies by operation
Antibiotics	None	Used in some operations to manage disease in high-density pens
Color	Natural astaxanthin from diet (pink/red in salmon)	Often added synthetically (listed as “color added” on labels)

Practical takeaway: wild-caught small fish (sardines, mackerel, anchovies, herring) are the best option — high omega-3, low mercury, no farming concerns. Wild-caught salmon is excellent but more expensive. Farmed salmon is still better than no fish — the omega-3 content is lower but not zero. The hierarchy: wild small fish > wild salmon > farmed salmon > no fish.

Grass-fed/finished vs grain-fed beef

Factor	Grass-fed/finished	Grain-fed (conventional)
Omega-3	2–5× higher (still modest compared to fish)	Lower; omega-6:omega-3 ratio is worse
CLA (conjugated linoleic acid)	2–3× higher	Lower
Vitamin A and E	Higher (from fresh grass)	Lower
Protein	Comparable	Comparable
Total fat	Leaner in most cuts	More marbling; higher total fat

Important distinction: “grass-fed” and “grass-finished” are different. Some cattle eat grass early then switch to grain in feedlots for fattening. Only “grass-fed AND grass-finished” (or “100% grass-fed”) means the animal ate grass its entire life. Labels vary by country — check certifications.

Practical takeaway: grass-finished is nutritionally superior, but conventional beef is still a high-quality protein source. If budget is limited, prioritize wild fish over upgrading beef.

Pastured vs conventional eggs

Factor	Pastured	Conventional (caged/barn)
Vitamin D	Up to 3–6× higher (hens get sunlight)	Lower — indoor hens produce less
Omega-3	2× higher from insects and grass	Lower; feed is primarily corn/soy
Vitamin A	Higher (darker orange yolk indicates more carotenoids)	Paler yolk, fewer carotenoids
Vitamin E	Roughly 2× higher	Lower
Protein	Comparable	Comparable

Practical takeaway: pastured eggs are one of the cheapest nutrient upgrades available. The yolk is where the quality difference concentrates — eat the yolk. “Free-range” and “cage-free” are weaker standards than “pastured” — they may only mean access to a small outdoor area.

Organic vs conventional produce

This one is more nuanced than the marketing suggests:

• Pesticide residue — organic produce has lower synthetic pesticide levels (organic farming uses natural pesticides, which are not necessarily safer). Washing and peeling removes most surface residue from conventional produce
• Nutrient content — studies show modest or no consistent nutrient advantage for organic vs conventional; soil quality and freshness matter more than the organic label
• The “Dirty Dozen” approach — if budget is limited, buy organic for thin-skinned produce that absorbs more pesticides (strawberries, spinach, apples, grapes) and buy conventional for thick-skinned produce (avocados, bananas, onions, melons)

Practical takeaway: organic certification doesn’t guarantee higher nutrient content. Local, seasonal, recently harvested produce often beats out-of-season organic shipped from across the world — freshness degrades nutrients faster than farming method improves them.

The priority ladder for food quality upgrades

When budget forces choices, upgrade in this order (highest impact first):

1. Wild small fish over farmed large fish — biggest omega-3 and contaminant difference
2. Pastured eggs over conventional — cheap upgrade, large nutrient difference in the yolk
3. Organic “dirty dozen” produce — reduces pesticide exposure where it matters most
4. Grass-finished beef over conventional — meaningful but smaller nutrient difference than fish or eggs
5. Local/seasonal produce over imported organic — freshness often outweighs farming method

Meal composition — how combining foods changes everything

Eating macronutrients together changes how your body responds compared to eating them alone.

Protein + fat + fiber = flattened glucose curve

Adding protein, fat, or fiber to a carbohydrate-containing meal:

• Slows gastric emptying → slower glucose entry into the bloodstream
• Reduces peak blood glucose by 20–50% compared to carbs alone
• Reduces peak insulin by a similar margin
• Increases satiety → less total food intake over the day

Practical example:

• White rice alone → fast glucose spike, fast insulin spike, hungry again in 2 hours
• White rice + salmon + vegetables → slower absorption, lower peak, fuller longer
• Cooled rice + salmon + vegetables → even better (resistant starch reduces available glucose further)

Order of eating matters

Emerging research suggests that eating fiber and protein before carbohydrates in a meal reduces the glycemic response more than eating everything mixed together. The fiber and protein slow gastric emptying before the carbs arrive.

Individual variation

No single diet works identically for everyone. Key genetic and environmental factors:

Genetic variation

• CYP1A2 — determines caffeine metabolism speed; fast metabolizers clear caffeine in ~3 hours, slow metabolizers in 7–9 hours. See caffeine
• FTO (fat mass and obesity-associated) gene variants — associated with appetite regulation; some variants increase hunger signaling, making caloric surplus easier
• ApoE4 — affects cholesterol metabolism; carriers may need to limit dietary cholesterol and saturated fat more than others
• MTHFR (methylenetetrahydrofolate reductase) — affects folate metabolism; common variants may need methylfolate instead of synthetic folic acid
• Lactase persistence — genetic variation determines whether you produce lactase into adulthood; ~65% of the global population reduces lactase production after childhood

Microbiome variation

The same food produces different glucose responses in different people — partly because their gut bacteria process it differently. A study that tracked 800 people found that individual glucose responses to identical meals varied by up to 4×. Factors: microbiome composition, sleep quality, stress level, recent meals, meal timing.

Activity level

• Sedentary person and competitive athlete have very different carb needs (roughly 150g vs 400g+ per day depending on training volume)
• Training is associated with improved insulin sensitivity → muscles absorb glucose more efficiently
• Resistance training increases resting metabolic rate through added muscle mass
• Post-workout nutrition window: real but overblown — total daily intake matters more than exact timing

Ultra-processed food — the primary enemy

Ultra-processed foods (UPFs) are industrial formulations with ingredients you wouldn’t find in a kitchen: emulsifiers, thickeners, artificial colors, hydrogenated oils, high-fructose corn syrup, artificial sweeteners, and preservatives.

Research consistently shows that a 10% increase in ultra-processed food consumption is associated with:

• Higher all-cause mortality
• Higher cardiovascular disease risk
• Higher rates of metabolic syndrome, type 2 diabetes, and obesity
• Gut barrier damage (emulsifiers directly increase intestinal permeability)

Why UPFs are different from whole foods with the same macros:

• Engineered for hyper-palatability → overrides natural satiety signals
• Low nutrient density despite high calorie density
• Contains inflammatory additives (emulsifiers, trans fats, excessive omega-6)
• Lacks fiber, polyphenols, and protective compounds found in whole foods
• Often contains compounds that damage the gut barrier

The klatiPRO rule is simple: if you can’t identify every ingredient, don’t eat it.

Putting it all together — the klatiPRO nutrition framework

Principle	Target	Why
Protein first	2g/kg goal weight; ≥30g/meal	Muscle building, satiety, highest TEF
Cook with stable fats	Ghee, tallow, lard, butter	No oxidation products at cooking temps
Daily olive oil	2 tbsp raw EVOO	Anti-inflammatory polyphenols
Front-load carbs	Most carbs at breakfast + lunch	Aligns with peak insulin sensitivity
3–4h meal spacing	No snacking	Bile refill, insulin baseline, MMC cleaning wave
Fiber from whole foods	25–30g/day	SCFA production, gut barrier support
Limit fructose	<20g/day (men) from added sources	Liver protection
Omega-3	2,000+ mg EPA+DHA/day	Rebalance omega ratio, reduce inflammation
Eliminate UPFs	No ultra-processed food	Removes the primary dietary damage source
Eat real food	If you can’t identify ingredients, skip it	Simplest rule for food quality

Each of these principles is explained in depth in the linked posts. The protocol page (klatiPRO) puts it all into a daily routine.

• check klatiCHECK for klati approved sources

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Research