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Level of Effort: Medium

Limitations: In Phase 1, you can’t have alcohol, soda, trans fats, fried foods, white bread, or full-fat milk and yogurt. In Phases 2 and 3, you may use some of those foods as your "anything-goes calories."

Cooking and shopping: You’ll cook or eat as usual, as long as you stick to the Best Life guidelines and add the vitamins and supplements Greene suggests.

Packaged foods or meals? No.

In-person meetings? No.

Exercise: Required. You’ll do cardio and strength training, ramping it up with each phase of the diet. It will take time, ranging from 90 minutes a week to 6 hours a week or more.

Does It Allow for Dietary Restrictions or Preferences?

Vegetarians and vegans: You can easily adjust this diet to make it work for you.

Low-salt: The plan slowly phases out high-sodium foods. But if you're closely watching your sodium levels, check food labels. The same goes for fat.

Gluten-free: This diet doesn't specifically avoid gluten, so check food labels carefully. The Best Life web site says you can set diet preferences and add custom foods when choosing a meal plan.

What Else You Should Know

Cost: None besides your groceries.

Support: You can join The Best Life'sonline community for $9.95 per month or $69.95 a year. There's a free 30-day trial if you want to try it out first.

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