NSES Content Standard C  Life Science: Matter, energy, and organization in living systems Grades 9-12, page 186 The chemical bonds of food molecules contain energy. Energy is released when the bonds of food molecules are broken and new compounds with lower energy bonds are formed. Cells usually store this energy temporarily in phosphate bonds of a small high-energy compound called ATP.

 
Benchmark 4E The Physical Setting: Energy Transformations
Grades 9-12, page 86
Different energy levels are associated with different configurations of atoms and molecules. Some changes of configuration require an input of energy whereas others release energy.

Benchmark 5E The Living Environment: Flow of Matter and Energy
Grades 6-8, page 120
Energy can change from one form to another in living things. Animals get energy from oxidizing their food, releasing some of its energy as heat. Almost all food energy comes originally from sunlight.