Question

why should we avoid carbohydrates and fats

Answer 1

Replacing carbohydrates with fats and higher fat sources of protein could increase your intake of saturated fat, which can raise the amount of cholesterol in your blood – a risk factor for heart disease. When you're low on glucose, the body breaks down stored fat to convert it into energy.

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Answer 2

if they are taken too much it leads to increases to unwanted cholesterol which causes diabetes since too much of insulin is used in in digesting the sugar and once the insulin is over the sugar is not be converted into glucose which will cause diabetes