11 Foods Fitness Experts Never Eat—even During the Holidays

While you might think it’s better for you than butter, margarine contains trans fats, which increase blood cholesterol levels and the risk of heart disease, says David Zulberg, ACE-certified fitness specialist and author of The 5 Skinny Habits: How Ancient Wisdom Can Help You Lose Weight and Change Your Life Forever. It also lowers HDL cholesterol levels—the ones you want to have in higher numbers.

So if you must use margarine, look for a brand that has the lowest calories, the least amount of saturated fat, and contains no trans fats, he says.

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