Author: Mark Bittman
Premise: Bittman, a New York Times food writer, proposes eating vegan until 6 p.m., when you can allow yourself moderate amounts of meat and dairy. Bittman devised this diet for himself and saw a drop in pounds and an improvement in his heart health.
Strictness: +++
Author: Rip Esselstyn
Premise: The author created this diet for his fellow unhealthy firefighters. A strict vegan diet, he also cuts out vegetable oil.
Strictness: +++++
Author: Dr. Dean Ornish
Premise: The world-renowned heart doctor and researcher offers a low-fat, low-sodium, largely vegetarian diet. The reader is encouraged to devise his or her own diet using his guidelines.
Strictness: +
Author: Dawn Jackson Blatner
Premise: Blatner bases her diet on five food groups: new meat (tofu, beans, lentils, peas, nuts, seeds, and eggs), fruits and veggies, whole grains, dairy, and sugar and spice. The book provides you with a five-week plan, and you can swap out different recipes to suit your tastes—with the option to eat meat on occasion.
Strictness: ++
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