Not only that, we have to stop being dogmatic to diet fads...
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It's all bs. Eat a balance diet and get off the couch.
It doesn't seem like it could be put better. Junk foods abound in the average American diet and combined with sitting at a desk all day and being a couch potato all night you end up with a population that was 42% obese (and not jets) in 2018.
Something I would have done immediately upon commissioning is not buy a brand new car, and gotten a car that I could pay for in cash instead, and take that USAA Career Starter Loan (didn't use that for the car either, another thing I should have done) and dump it into my biggest/highest APR student loan. Reason is that the car lost its luster for me after a few years, there's always something nicer and faster, and the student loans are still hanging over my head. I thank my parents for helping me out with the car loan. Probably one of the best gifts they could have given me. Now I'm going to hang on to this thing until the wheels fall off.
I would have not bought a bunch of nice shit like a couple guns, dress clothes, and the newest iPhone just because I suddenly had a better paycheck. Reason being is none of that stuff made me a better student naval aviator, which is my job. It was just a distraction that made me feel better for a week or two until I got the itch to buy some other thing. Plus when I found out that my biggest deferred student loan was actually gaining interest the entire time I was taken aback; I did an immediate about face on my spending. Now I'm "avalanching" my student loans, meaning I dump as much money as I can afford into the biggest/highest APR one until I pay that off and then dump that same payment into my other smaller loans to create a payoff avalanche so they aren't nipping at my bank account for the next 20 years. Plus I invest my flight pay in the market in mutual funds and started a personal IRA that I chuck a hundred at every month so what I don't spend on student loans is still working for me in the future.
I would have invested more in my health while I was still at my peak after OCS; eat right, drink water, work out enough to stay fit, sleep well, and stop drinking just to drink like I did in college. Being in good shape with proper diet and as much good sleep as you can get makes your life better. Your body will absorb the abuse you give it but you will not feel good in the end. Now I eat very cleanly, sleep on as much of a regular schedule as flight school allows, and study my ass off when I'm not working out; the result is that my performance as a student naval aviator and my general feeling as a person has markedly improved so I will continue.
What's the point? Even though you get told a thousand times about these things I still did them. So do plenty of other O-1s (and young Americans) so the message doesn't work so well. Yes it was my choice and my responsibility but the message didn't get through to me until I grew up a bit and learned on my own. I don't remember getting any real lessons in personal finance or health besides my parents telling me when I was a teenager to pay off my credit card every month and don't max that out, which was great advice that I've followed religiously I'll admit.
Do I deeply regret any of my decisions? Not really. I learned something valuable so I won't repeat those mistakes and that matters. No sense in being a old rich miser either, so set aside some money to live a little every month that you won't feel bad about. I usually spend that on cigars, golf, and shooting.