Osasnidas:
You will gain weight when you dont burn calories ask those sedentary people

You can't become fat on carbohydrates alone, you need fatty foods with it, too much everything is bad, when you eat carbohydrates some part of it will be converted to fats. The fats from carbohydrates and the one in your food will make you fat

Ofcourse, you can get fat from carbs alone. Carbohydrates can converted to fat.