The Engine 2 Diet presents two diet plans: One introduces readers to a flexitarian approach to eating, which includes plenty of healthy fruits, veggies and legumes, and the second is an entirely plant-based way of eating. Both advocate a healthy, life-long approach to eating that includes plenty of nutrient-dense foods, so there's no calorie counting or portion control necessary. As an added bonus, Esselstyn's father, noted physician Caldwell Esselstyn Jr., has given his stamp of approval to the plan, so you can trust that it's a healthy way of life.

Teaching sustainable healthy habits is the first indicator that this is a healthy, worthwhile plan. The fact that it's doctor-approved is the second. Looking to trim down and improve your health? This might be just the thing you need.

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