The same rice spikes my blood sugar but not my sister's

How fast you turn carbohydrates into blood sugar is partly genetic, shaped by genes like AMY1 that vary a lot even between siblings.

Why it happens

AMY1 controls how much carb-digesting enzyme your saliva makes. Some people carry many copies and break starch down fast, others few. Two siblings can eat the same rice and see very different blood-sugar curves an hour later. For a population with India's diabetes burden, this matters.

One thing to try

Add protein or fibre to your highest-carb meal, a bowl of dahi, a side of sprouts. Same meal, slower curve.

Each decode is a research-backed tendency, not a diagnosis. A tap tells you how your body is likely wired and what to try, it does not label you, and nothing here is a substitute for a doctor where a medical question is involved.