In contrast, the 2017-2020 Dietary Guidelines for Americans (DGAs), issued by the U.S. Agriculture and Health and Human Services departments, suggest sugar substitutes may have a place in helping people consume fewer calories, at least in the short term, though "questions remain about their effectiveness as a long-term weight management strategy." The guidelines neither encourage nor discourage their usage.

相比之下，美国农业部、美国卫生部和美国社会福利部门共同发布的《美国膳食指南2017版》（2017-2020 Dietary Guidelines for Americans）建议：甜味剂或能帮助人们减少卡路里摄入量，至少短时间内会做到这一点，尽管"作为一种长期体重管理策略，其有效性暂待商榷。"该指南对甜味剂持既不鼓励也不阻止的态度。

The differences may seem subtle, but dietary guidelines in each country shape what is served at public institutions such as schools and influence the recommendations made by health-care professionals. Language matters. But before we try to explain the difference in advice, let's have a quick primer on sugar substitutes.

虽然差异细微，但各国的膳食指南却会对学校等公共机构的食物供应产生影响，而且也会影响医疗保健专业人士给出的建议。语言也很重要。但在解释各国膳食指南的差异之前，还是先了解一下甜味剂吧。

What are sugar substitutes?

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