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Level of Effort: Medium

There’s no calorie counting or special meals to buy. But you’ll need to organize your schedule around regular meal times. Cruise suggests eating breakfast at 7 a.m., lunch at 1 p.m., and dinner at 7 p.m., or eat dinner early enough so that you finish 3 hours before bed.

You’ll also have to plan ahead for two 100-calorie snacks, such as a small handful of nuts or a piece of string cheese.

Cooking and shopping: You can cook the recipes provided using readily available ingredients, or choose from a list of frozen and fast foods. A companion cookbook, The 3-Hour Diet Cookbook, offers more recipes that have appropriate portion sizes.

Packaged foods or meals: None required.

In-person meetings: No.

Exercise: Optional.

Does It Allow for Dietary Restrictions or Preferences?

Yes. You can choose any foods you like. It’s flexible enough to accommodate vegetarians, vegans, and low-fat and gluten-free diets.

What Else You Should Know

Cost: None apart from your grocery shopping.

Support: You do this diet on your own. You can also use the 3 hour diet app, which reminds you to eat every 3 hours and helps you track how many meals you’ve eaten.

WebMD Medical Reference

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