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Bone broth contains collagen precursors — but evidence that oral collagen improves joint health is limited.
Vitamin D is technically a hormone — it's produced in the skin from sunlight and regulates hundreds of genes.
The science of taste-smell interaction explains why food tastes different at altitude — airplane food must be seasoned more aggressively.
Polyphenol-rich olive oil has been shown to produce an anti-inflammatory effect similar to ibuprofen.
Caffeine blocks adenosine receptors — it doesn't give you energy, it prevents you from feeling tired.
The liver is the primary site of fat metabolism — it processes dietary fat into forms the body can use or store.
Ancient humans may have consumed up to 100 grams of dietary fiber per day — modern diets average about 15 grams.
The WHO recommends less than 5 grams of salt per day — the average person consumes about 10 grams.
Sodium (salt) is essential for nerve and muscle function — but excess causes water retention and raises blood pressure.
Cooking food breaks down cell walls and makes nutrients more bioavailable — cooked carrots have more accessible beta-carotene than raw.
The average person has between 500 and 10,000 different species of bacteria in their gut.
Pea protein has an amino acid profile close to egg white and is increasingly used as a plant-based protein source.
The white color of fat on cooked meat comes from myoglobin and fat proteins denaturing with heat.
Freezing food does not kill bacteria — it pauses their activity. Thawing can allow rapid growth if done improperly.
The recommended daily allowance (RDA) for vitamins was established during WWII to prevent deficiencies in soldiers.
The 'food coma' after a large meal is caused by blood diversion to digestion and a rise in serotonin and melatonin.
Anthocyanins — pigments in blueberries and red cabbage — reduce inflammation and may protect against cognitive decline.
Ancient hunter-gatherers likely ate a high-protein diet (25–30%) — modern recommendations are much lower.
The average human digestive tract is about 9 meters long — food takes 24–72 hours to pass through completely.
Iron absorption from plant foods is inhibited by phytates and enhanced by vitamin C — combination matters.
Nutritional epidemiology is limited because diet is notoriously hard to measure accurately — people misremember and misreport.
Cruciferous vegetables (broccoli, kale, cabbage) contain glucosinolates that break down into cancer-fighting compounds.
The 'dose makes the poison' — almost every substance is toxic at a high enough dose and beneficial at the right one.
Ancient humans likely consumed far more dietary variety than modern people — hunter-gatherers ate 150+ plant species.
Zinc deficiency affects over 2 billion people worldwide — it impairs immune function, growth, and wound healing.
The Atwater factors for calculating calories (4 kcal/g protein, 4 kcal/g carb, 9 kcal/g fat) are approximations.
Resistant starch — found in cooked and cooled potatoes and rice — feeds gut bacteria and has a lower glycemic index.
The brain uses glucose almost exclusively — a drop in blood sugar causes cognitive impairment within minutes.
Intermittent fasting works partly by increasing insulin sensitivity and promoting cellular cleanup (autophagy).
Vitamin C is required for collagen synthesis — without it, tissues break down (scurvy).
The taste of fat (oleogustus) has recently been proposed as a sixth basic taste distinct from the other five.
Ultra-processed food comprises over 58% of the average American's calorie intake.
The Maillard reaction produces over 1,000 flavor compounds when food browns — far more complex than raw food.
Fiber feeds beneficial gut bacteria — low fiber intake starves the microbiome, reducing diversity and immune function.
Polyphenols in dark chocolate improve blood vessel function and reduce blood pressure — in doses of 70%+ cacao.
Coffee is one of the most antioxidant-rich foods in the typical Western diet.
The human body stores about 2,000 calories of glycogen — enough for about 20 miles of running.
Eating too little protein causes the body to break down muscle tissue for amino acids — especially during weight loss.
The gut microbiome is increasingly linked to mental health — gut bacteria produce 95% of the body's serotonin.
Alcohol is the only macronutrient that provides calories (7 kcal/g) while also impairing metabolism.
High fructose corn syrup is metabolized differently from table sugar — the liver processes fructose directly without hormonal signaling.
Phytochemicals — plant compounds — have hundreds of health-protective effects that vitamins alone cannot replicate.
The Mediterranean diet is the most studied dietary pattern in the world and consistently associated with reduced disease risk.
Blue zones — regions where people live longest — share common dietary patterns: mostly plant-based, moderate alcohol, whole foods.
Fermentation increases the bioavailability of nutrients — fermented foods are often more nutritious than their unfermented versions.
The glycemic index measures how fast carbohydrates raise blood sugar — refined carbs spike it faster than whole foods.
Capsaicin, the heat compound in chili peppers, binds to the same receptors as actual heat — your mouth is literally 'burning.'
All calories are not equal — protein requires more energy to digest than carbohydrates or fat.
The human body cannot synthesize the omega-3 fatty acid DHA efficiently — it must come from diet.
The highest score in bowling is 300 — a perfect game of 12 consecutive strikes.