To Eat or Not to Eat

So I am really trying to figure this diet thing out. The correct thing to do would be to talk to a nutritionist. however, I didn't become a doctor without having a basic rudimentary knowledge of nutrition. ( please don't comment on this, I am well aware that it is nonsense, just let it ride.)

So I hear that it is good to eat fish. Even salmon. I asked my panel of experts what they do with salmon, and if it is high in fats. they told me it is, but is is supposed to be good for you.  So we have been buying different kinds of fish and I went down to the pool ( freezer) to compare the different types of fish. Tilapia has one gram of fat per 4 ounces. Sounds good. Flounder has one and half for the same size portion, bring it on. ( Unfortunately I worry that the taste is on par with the fat content, low.) Then it was on to a can of tuna. one gram for two ounces, which relates to two grams of fat for the same size 9 at least my brain works, so the fish must be working).

Then I looked at the salmon

holy cow, or maybe we should eat the cow, it can't be higher.

a seven ounce piece has 20 GRAMS OF FAT with 7 SATURATED

I really need to figure this out.