wunder beta🥗 Nutrition Science & Dietary Biochemistry
Your body never uses food — only the molecules it breaks food into. This course rebuilds nutrition from the biochemistry up: what a calorie really is, how carbs, fats, and proteins are dismantled and
What you’ll learn
- Your Body Never Uses FoodReframe nutrition as biochemistry: the body uses molecules, not foods, and digestion is disassembly.Cells run on glucose, amino acids, fatty acids, ions, and vitamins — none of which arrive in food's original form. Digestion breaks the three macronutrients into absorbable units, while micronutrients ride along in tiny amounts as tools rather than fuel.
- Energy: The Calorie and ATPDefine the calorie, explain the Atwater factors, and introduce ATP as the body's energy currency.A food Calorie is a kilocalorie of energy, historically measured by burning food in a bomb calorimeter. Atwater factors give ~4 kcal/g for carbohydrate and protein and ~9 for fat (7 for alcohol). Cells convert food energy into ATP, a rechargeable molecule they spend to do all cellular work.
- Carbohydrates: The Fast FuelTrace carbohydrate from dietary starch through digestion, glycolysis, and storage, and explain fiber.Starch is a glucose polymer broken by enzymes into glucose (blood sugar), which cells burn via glycolysis and the mitochondria to make ATP; surplus is stored as glycogen, then fat. Fiber is carbohydrate human enzymes can't break, so it slows sugar absorption and feeds gut bacteria.
- Fats: Dense Fuel and Building MaterialExplain triglycerides, fatty-acid saturation and shape, and essential fatty acids.Dietary fat is mostly triglycerides — three fatty acids on glycerol — burned via beta-oxidation for dense energy. Saturation determines shape and physical state: straight saturated chains are solid, kinked unsaturated chains are liquid, and trans fats are industrially straightened. Certain omega-3/6 fatty acids are essential and structural in cell membranes.
- Protein and the Amino-Acid PoolExplain the twenty amino acids, the amino-acid pool, the nine essential amino acids, and the lack of protein storage.All proteins are built from twenty amino acids drawn from a shared pool that digestion restocks. Nine amino acids are essential — the body cannot synthesize them — so 'complete' proteins supply all nine. Unlike carbohydrate and fat, protein has no dedicated store, so steady intake matters.
- Vitamins and Minerals: The CofactorsExplain micronutrients as enzyme cofactors, the water/fat-soluble split, and scurvy as a case study.Vitamins and minerals provide no energy but act as cofactors that enzymes require. Water-soluble vitamins (B, C) aren't stored much; fat-soluble vitamins (A, D, E, K) are stored and absorbed with fat. Scurvy shows the stakes: vitamin C is the cofactor for building collagen, and its absence caused fatal tissue breakdown in sailors until citrus was adopted.
- Metabolism: Fed and FastedExplain fed vs fasted metabolism, insulin/glucagon regulation of blood glucose, and fuel switching.Insulin (after meals) drives glucose uptake and storage; glucagon (between meals) releases stored glucose — a balancing loop that steadies blood sugar. As glycogen runs low the body burns fat via beta-oxidation and can make ketones. Weight change reflects the net balance of energy intake and expenditure at the molecular level.
- Reading the Whole PlateAdd water and electrolytes, and synthesize the course into reading a nutrition label as a molecular inventory.Water is the medium of all reactions and electrolytes carry nerve and muscle signals and balance fluids. A nutrition label becomes a molecular summary: calories as energy, macro grams (4/4/9) as its source, fiber as unabsorbed carbohydrate, added sugars as empty fuel, and sodium as an electrolyte. Every nutrition question sharpens through the molecule lens.
Questions this course answers
The course's central reframing of nutrition is that:
Cells run on glucose, amino acids, fatty acids, and ions; digestion breaks food into those molecules. Thinking in molecules makes nutrition mechanical.
Macronutrients differ from micronutrients in that macros:
Carbs, fats, and proteins are needed in grams and provide fuel and structure; vitamins and minerals are needed in tiny amounts and provide no energy.
A food Calorie (kilocalorie) is fundamentally a measure of:
One kilocalorie is the heat to raise 1 kg of water 1°C; a bomb calorimeter measures a food's energy by combusting it.
The Atwater factors give roughly how many kcal per gram for carbohydrate, protein, and fat?
Carbohydrate and protein each yield about 4 kcal/g; fat yields about 9 — which is why fat is so energy-dense (alcohol is ~7).
Cells cannot spend calories directly; instead energy from food is used to make:
ATP is the universal energy currency — a rechargeable molecule cells spend to power work, then recharge using food energy.
Starch is:
Starch is a glucose polymer; salivary and intestinal enzymes snip it into glucose, which is absorbed as blood sugar.
Grounded in trusted sources
- Jeremy M. Berg, John L. Tymoczko & Lubert Stryer, 'Biochemistry' (W.H. Freeman)
- Institute of Medicine, Dietary Reference Intakes (National Academies Press)
- FAO, 'Food energy — methods of analysis and conversion factors' (2003)
- U.S. FDA — Nutrition Facts label guidance; USDA FoodData Central
- James Lind, 'A Treatise of the Scurvy' (1753)
Every Wunder lesson is built from real, reputable sources — never invented.
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