F.r.e.e. p.o.i.n.t.s.

f.r.e.e p.o.i.nt.s          

Explanation:

Can you give be brainliest?

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Explanation:

Since sugar comes from food, digestive system would directly affect blood sugar levels. The food that we eat will go to the digestive system. It is there where the food breakdown to nutrients, fats, or waste. Therefore, the correct answer is digestive system.