monophagism
1monophagism — Habitual eating of but one kind of food or but one meal a day when the latter is clearly an aberration. [mono + G. phago, to eat] * * * mo·noph·a·gism (mə nofґə jiz əm) monophagia …
2monophagous — a. eating one kind of food only. ♦ monophagia, ♦ monophagism, ♦ monophagy, n …