減食

プログレッシブ和英中辞典(第4版)

げんしょく【減食】

a diet

減食する reduce one's intake of food; diet; cut down on one's meals

目下減食中です
I'm 「cutting down on what I eat [dieting/on a diet] right now.

減食療法

a diet cure

減食療法を施す
reduce a patient's intake of food／treat a patient by reducing his [her] intake of food

出典　小学館「プログレッシブ和英中辞典(第4版)」