Diet Plan Testimonials Round 2: Vegan

The two vegan dieters had an easier time during the second week, as they got used to the diet, and one reported unusually high energy levels and a huge improvement in mood. While they both said the diet was both demanding and expensive, they also felt much healthier -- so much so that there was already talk of extending the diet beyond the three weeks planned.

"Going to restaurants is extremely difficult," says Guillaume, an e-commerce manager who went vegan and reported regularly experiencing what he calls "food envy."

But, "If anything, it made me realize how badly I was eating before," he says. "I think after, I'll still have meat, but different amounts and for different occasions."