The 3500-kcal rule, honestly — rough maths that still works
You have heard that a 3500 kcal deficit melts exactly one pound of fat. The number is a 1958 estimate, not a perfect law, but it is still a fine rough guide for reading your own Burnie log.
15 Jul 2026 · Burnie Academy
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You have heard this line a hundred times. Cut 500 kcal a day, and you lose one pound (about 0.45 kg) in a week. The maths feels neat and tidy. But the body is messier than the maths. So where did this 3500 kcal rule come from, and does it still hold up? This is the honest story of a famous number.
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