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A specialist in the study of nutrition, 9 letters
Activity of many Americans, 7 letters
On the way down, perhaps, 7 letters
Post-New Year's activity, 7 letters
Eat sparingly, for health reasons or to lose weight, 7 letters
The act of restricting your food intake (or your intake of particular foods), 7 letters
Beginning of a quip for losers, 9 letters