Still, if you're trying to limit saturated fat in your diet by enjoying low- and fat-free foods, the trade-off may be worth it if you limit sodium in other areas.

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But he admits that people should stick to reduced-fat hamburger, and limit their egg intake.

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Designed after the 2010 Dietary Guidelines for Americans, the new rules require schools that participate in federally funded school lunch programs to offer fruit and vegetable daily and in larger quantities than in the past, serve only fat-free or low-fat milk, and limit calories by age.

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