Question

expain how the energy we get from food in directly comes from the sun.

Answer 1

as during the process of photosyntheses, plants takes up the heat of sun  and prepares its food and the food is consumed by us.

Answer 2

Sun is the ultimate source of energy. When plants perform photosynthesis they use this sunlight to make food. This food is eaten by us from which we get energy. Therefore the energy we get from food indirectly comes from the sun.