MDBG Mobile Chinese English Dictionary (iPhone, Android, Windows Phone)

低碳	dī tàn	(attributive) low-carbon; low-carb (diet)
国会	Guó huì	Parliament (UK) / Congress (US) / Diet (Japan) / Legislative Yuan (Taiwan)
素食	sù shí	vegetarian food / to eat a vegetarian diet
饮食	yǐn shí	eating and drinking / food and drink; diet
茹素	rú sù	to eat a vegetarian diet
节食	jié shí	to save food / to go on a diet
健怡可乐	Jiàn yí Kě lè	Diet Coke / Coca-Cola Light
坐月子	zuò yuè zi	to convalesce for a month following childbirth, following a special diet, and observing various taboos to protect the body from exposure to the "wind"
无麸质饮食	wú fū zhì yǐn shí	gluten-free diet
减脂	jiǎn zhī	to burn fat; to lose weight (through diet or exercise)
忌口	jì kǒu	abstain from certain food (as when ill) / avoid certain foods / be on a diet
盐酸克仑特罗	yán suān kè lún tè luó	clenbuterol hydrochloride (diet pill that burns fat) / e.g. Spiropent
纯素食主义	chún sù shí zhǔ yì	veganism, a diet consisting solely of plant products / strict vegetarianism
蔬食	shū shí	vegetarian meal / vegetarian diet
生酮饮食	shēng tóng yǐn shí	ketogenic diet
纯素食者	chún sù shí zhě	a vegan / person following a vegan diet
杂食	zá shí	omnivorous (zoology) / snacks / a varied diet
开斋	kāi zhāi	to stop following a vegetarian diet / to break a fast
饮食疗养	yǐn shí liáo yǎng	diet
斋	zhāi	to fast or abstain from meat, wine etc / vegetarian diet / study room / building / to give alms (to a monk)