It's certainly helpful if you're into organic food. It's also a very rewarding experience to be able to grow your own garden, and will certainly taste better than anything commercially available. It requires a lot of work though, so don't put in the effort unless you're willing to go through...
Salmon is just one of the fish we have a lot of, especially in the pacific northwest. It's been a staple in native american diets in that area for centuries. Also, salmon is just plain healthy for you. Its loaded with omega 3 fatty acids (unsaturated fat, the good kind).
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The thing about cooking foods is, yes, it does destroy a few of the nutrients in veggies. But, it also helps to break down the cell walls which your body can't digest to get to the rest of the nutrients. In raw food, you don't lose any nutrients, but some might get passed undigested...