Our expert says:
I presume that by "a high grade catabolic food" you are referring to the concept that some foods contain so little energy (kJ) that they practically use up more energy during digestion than they supply? Basically such foods have a very low energy content and consist mainly of water. Examples are lettuce, cucumber, gherkins, berries, grapefruit, etc. Now while it is useful to include these foods in slimming diets to provide variety and fill you up without loading you with kJ, no one can eat only these low-energy foods and stay healthy or energetic.
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