There are geographical, cultural and social differences when it comes to nutrition, but from the moment that bit of food is consumed by a person, those differences fade away. It doesn't matter where in the it comes from, carbs, proteins and fats all get chewed, digested and processed through the same metabolic pathways. NO ONE is exempt from the law of thermodynamics. Energy cannot be created or destroyed. Only converted from one form of energy to another. Every day people take energy into their bodies in the form of food and use that energy to sustain life.
Metabolism
...is the chemical processes within a living organism that provide energy. Its one of may things that distinguishes us from non-life. Metabolism supplies energy at rest, during physical activity and recovery.
Yes, energy comes from the food we eat, but the primary source of food to sustain life on Earth comes from the sun:
Energy contained in our food supply is generated in the sun and radiated toward earth as light
Plants and algae use lights as the energy source to power photosynthesis, which is the conversion of CO2 and water into glucose and oxygen
The sun's energy is effectively "stored" in the chemical bonds of glucose molecule created by photosynthesis
Plants then either break down that glucose to use the energy directly in support of their own life, or store it for later in the form of sugars, starches, or fats.
Plants are consumed directly or indirectly by eating other animals. The sun's energy that was stored in the plants has effectively been transferred into food to support life.
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