To create energy-providing carbohydrates from the non-energy-providing molecules H2O and CO2 is a talent limited to plants and a handful of bacteria. In a process called photosynthesis, these life-forms are able to couple H2O and CO2 by harnessing solar energy. Along with carbohydrates, oxygen is also a product of this reaction:
Humans are unable to perform photosynthesis and thus we eat plants and plant products such as fruits, vegetables, legumes, and grain products to obtain a rich supply of carbohydrates. Beyond plants and their products, milk and dairy are also good sources of carbohydrates. In fact, milk and some dairy products are the only considerable source of carbohydrate from animal foods. It should be mentioned that although humans cannot perform photosynthesis, we do possess the ability to make some carbohydrate in our body. However, in order to do so, we must start with molecules that already possess energy, as we will discuss soon enough.
Diet carbohydrate is largely derived from plant and dairy based foods.
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