Your APOE type decides how your body handles saturated fat and cholesterol. Some versions shrug off butter and steak; others see LDL spike fast. Knowing yours ends the "is saturated fat evil?" debate—for you personally.

The number of calories you burn lying completely still varies up to 300–400 kcal/day between people of the same size. Knowing your baseline stops the frustration of "why am I not losing weight on 1,500 calories?"

Some people drop cholesterol and feel full on high-fiber meals. Others barely notice. This tells you whether loading up on oats and vegetables is a game-changer or just extra chewing.

Your genes determine whether you thrive on 45–65% carbs or feel better under 30%. Matching intake to your insulin sensitivity and carbohydrate metabolism keeps energy stable and weight easier to manage—without forcing a diet philosophy that doesn't fit your biology.