Linked from
The 8 pages that link to Food energy, each with the reason it gives.
JouleRelated: Nutrition labels express the body's available energy in units convertible to joules.
Sugar alcoholRelated: Sugar alcohols generally provide less energy per gram than digestible sugars.
Skimmed milkRelated: Less fat generally makes skimmed milk lower in energy than whole milk.
Human foodRelated: Energy content is one of the main reasons people consume food.