I found a blog one afternoon before I was serious about losing weight (I wanted to, just hadn't found the motivation to do it the proper way). This lady did the raw food diet and lost 20lbs in a month. She updated her blog everyday with the foods she ate, recipes she used, how she felt, etc. I decided that I needed to go raw and I would magically lose weight like this lady.
I went to the store like you did, bought a silly amount of vegetables, $100+. I followed the blog lady's first two days of recipes, had horrrreeeeendous stomach cramps. Once the cramps passed, I felt starved and deprived (even though I was eating a ton of fruits/veggies/nuts including protein and fat). My willpower lasted about two days until I caved and went and got the biggest juiciest meatiest most cooked burger I could find. My vegetables went bad in a few days and I threw $100+ in the trash.
I have taken organic chemistry, biochemistry, and several nutrition courses. I can confidently tell you that the useful nutrients in food will not be harmed by applying heat. Heat increases the vibration moment of molecules which will change the stereochemistry (the shape) of protein peptides, but it will not change the usefulness to the body. Your body is just as capable of extracting the nutrition from a raw protein as it is a denatured cooked protein.
It's fairly gimmicky and fad-ish, in my opinion.




