MARLO THOMAS
11/04/2013 10:26 am ET Updated Dec 06, 2017

Why You Should Write Down Everything You Eat, From Dolvett Quince (WATCH)

Do you really have to count calories in order to lose weight? According to Dolvett Quince, "The Biggest Loser" trainer and author of "The 3-1-2-1 Diet," the more of a plan you have, the more successful you're going to be. Get educated about the foods that you're putting into your body. Guessing at how many calories you should be eating per day won't help you reach your goals!

Check out Dolvett's new book, "The 3-1-2-1 Diet" -- available now!

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