. >> i've done nutrisystem, slim fast, weight watchers, jenny craig, diet center, medifast. >> but youon those diets. >> yeah, over the years, i've lost 20 pounds, put back 25, lost 30 pounds, put back 35. >> so what makes this diet different? >> because the main thrust of this diet is enjoying your food. and really paying attention. >> but it's working. she says she's lost 11 pounds in five weeks. >> everything fits better. everything looks better. which is really important to me. >> portion control has been the secret to rachel's success. >> but this is an american portion. i have to whittle it down. >> to a french size. >> to a french size. >> and when we sat down for lunch, that single serving filled a family size bowl. >> that's a super size salad. >> the french people, they enjoy every bite they take in. this is one of the secret keys of the french food. >> dr. jean michelle cohen is the expert behind the french guide to skinny eating. he's also the host of a french tv show in france. dr. cohen says it's not so much a diet, but a new attitude towards food. he showed me the differ