Ditch the diet soda immediately. Ditch all sodas. If you can't live without them - try a week or two on Seltzer. I realized the the actual addictive part of all sodas to me was the carbonized tingling part. If you need it sweet and have an Ikea in your neck of the woods - get syrup concentrate and mix it. Like this one:
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It comes in other flavors too.
This thing is concentrate. You need less than 1oz at the bottom of a glass, pour cold seltzer on top. It's still sugar, still not good for you, but skips on many of the really nasty things you get in usual sodas.
If you have a trader Joe's get through one bottle of this, monthly:
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That one is not for kids. No sugar whatsoever. Crazy sour.
And, force yourself to go through this book. Probably the best laid out work on the difference between calories and nutrients, the effects of different vegetable vs animal fods.
Eat to live, by Joel Fuhrman:
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There are several editions, and frankly you can go with any of them. They are available on Ebay used for five bucks.
The cover is all about fancy-shmantzy weight loss and whatnot, but I suspect that it was chosen to attract attention, because if it was named "
How to learn to reconcilliate your body with fruits and vegetables" it wouldn't sell at all.
It is not about making anyone a vegetarian, it is not against meat, it simply explains - quite well - how our taste buds are constantly conditioned by the processed foods we are exposed to, what it does to our bodies, and how to get through it. It's an amazing book.
This is from a cynic who scoffs at anything that says "natural" and could live off Doritos for months.