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Food materials are source of methane a combustible gas which is formed by incomplete decay of food materials. Hence it is used as a fuel.
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Chemical energy.
Food is consumed and broken into ‘Units’ of energy, these are defined by how much ‘energy’ can be attained through their absorption into the body, all food is energy and is referred to as ‘kilojoules’ Calorific information is calibrated on-top of existing amounts of units of energy and what will be left over, or ‘un-depleted’ those are then broken down into anabolic ‘fats’ and associated saturates or bi-products and various ‘trace elements’
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Extensive employment experience in many varied occupations.
Food waste is one of the least recovered materials in the municipal solid waste stream and is one of the most important materials to divert from landfills. Food that is disposed of in landfills decomposes to create methane, a potent greenhouse gas that contributes to climate change.
More about the importance of diverting food waste from landfills
Fact: Food Waste Can Be Transformed Into A Natural Fertilizer
Of the less than 3% of food waste recovered from the waste stream, composting is the prominent diversion method. Composting, either in your backyard or in a commercial facility, creates a natural fertilizer with many beneficial qualities.
Most of food taken ultimately gets converted into Glucose in the body, which burns and releases chemical energy through the process of metabolism.
The basic answer to your question is ‘heat’.
It is a metabolic process which creates that energy.