Well, because 1 + 1 = 2, all the time, and the optimal diet is different for everyone?
1. To "educate" / program you on what to buy to sustain the rest of your life, eg, "breakfast is the most important meal of the day". Which is true if you are a cereal company:
https://www.successstudiopt.com/blog/is-breakfast-really-the...
2. People have arteries clogged with cholesterol. This is bad. Cholesterol is in eggs. Therefore eggs cause cholesterol build-up in the arteries and should be avoided. Eat cereal instead. This has been completely debunked.
Etc.
Does the education system teach kids about debt, why it's so bad, how to avoid it, ways it will sneak up and fuck you over (ARM, variable-rate credit card interest, ...)? Not when I went to school. There was no class on managing money in my entire 12 years of "education". Just another thing to figure out on your own, hopefully after many mistakes that enrich large corporations.
Currently in North America, school is optimized to solve two main problems:
1. Create citizens who work well in companies (sadly these are industrial-era: show up on time, parrot back what is told to you, be the same as everyone else)
2. Babysitting parents who are currently working for companies (this was especially obvious in Ontario’s approach to the pandemic).
If we optimized for population health/wealth things would look a lot different (and from the outside it looks like some private schools in America are already there).
Why bother having education system if you are supposed to figure everything out on your own?
How is nutrition different from math or grammar?