Question

If you consume only rice and potato in our diet how will it affect you

Answer 1

both are high in starch /carbohydrates and very less proteins . So , u will lack protein in ur diet .
Muscle loss is the main problem faced by those having protein deficient diet .
Include legumes,eggs, etc in ur diet alongwith carbohydrates to make it balanced.
any doubt regarding nutrition, feel free to ask :)

Answer 2

You will lack protein in your diet and it is not a balanced diet