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Foods like hamburgers and steak that contain fat have the most concentrated source of energy and are high in calories, according to the Mayo Clinic. Fat has nine calories per gram, and carbohydrates and protein have only four calories per gram, according to Penn State.
Source:
Mayo Clinic: Energy Density and Weight Loss
Penn State: Eat Water, Lose Weight
More Information:
University of Florida: Low Energy Density Foods
Kansas State University: Eat Energy Dense Foods to Reduce Food Cost
Northwestern University: Portion Size and Energy Density are Keys to Weight Loss
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