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Carbohydrates and proteins each provide about 4 kcal per gram, while fats provide about 9 kcal per gram (alcohol provides 7 kcal/g). These values are the basis for calculating energy intake and macronutrient-driven calorie targets.

Total glycogen stores in liver and muscle are roughly 300–500 g (≈1,200–2,000 kcal of usable energy), with replenishment rates after exhaustive exercise depending on carb intake and timing — optimal repletion occurs with ~1.0–1.2 g/kg/hour of carbohydrate in the first 4 hours post-exercise and continues more slowly after that.

Protein has the highest thermic effect (~20–30% of its energy used for digestion/processing), carbohydrates around 5–10%, and fats about 0–3%. This affects net calorie availability and means higher-protein diets modestly increase energy expenditure and satiety.

For most adults, a bolus of roughly 20–40 g of high-quality protein per meal (or about 0.3–0.4 g/kg/meal) maximizes acute muscle protein synthesis; older adults often need amounts toward the higher end due to anabolic resistance.

Carbohydrates raise insulin more than fat or protein, but weight gain is driven by prolonged energy surplus rather than insulin alone; insulin affects nutrient partitioning (promoting glycogen and fat storage) but overeating any macronutrient will increase adiposity.

Endurance athletes typically need high carbohydrate intakes (e.g., 6–12 g/kg/day depending on training volume) to maintain glycogen, while strength athletes prioritize protein (1.6–2.2 g/kg/day) to support hypertrophy and recovery with moderate carbohydrate (3–6 g/kg/day) for training intensity.

Nutritional ketosis commonly occurs when daily digestible carbohydrate intake is reduced below roughly 20–50 g/day, though exact thresholds vary by individual, activity level and protein intake; blood ketones in nutritional ketosis usually range ~0.5–3.0 mmol/L.

Replacing saturated fat with polyunsaturated fat consistently lowers LDL cholesterol and reduces cardiovascular events in randomized and pooled analyses; emphasizing unsaturated fats (olive oil, nuts, fatty fish) while limiting industrial trans fats is the evidence-based approach.

Carbohydrate intake strongly affects postprandial glucose and therefore medication dosing and hypoglycemia risk; SGLT2 inhibitors increase glycosuria and can raise ketone risk when carbs are very low, while metformin's glycemic effects are additive to dietary carbohydrate reduction—coordination with clinicians is essential.

Yes — macronutrient quality matters: e.g., diets high in refined carbohydrates and added sugars increase type 2 diabetes and CVD risk, while higher-quality proteins and unsaturated fats are associated with better cardiometabolic outcomes even when total calories are similar.