Ok, initially,
anything can be bad for you, even if it's not bad for anyone else.
A bit over 20 years ago, a Spanish philosopher came to Argentina, and was interviewed on a TV show. Among all the unproven, unscientific bullshit he said (which is to be expected from a philosopher), he said something that caught my attention. The guy was making a defense of drugs, and said "drugs don't kill anybody. Ignorance does". It's true.
Of course, with the huge amount of information available today comes a huge amount of misinformation. Here's what I do:
1. Supplements are not regulated by the FDA, so as a norm I stay away from them. Not only because they can be "bad" for me, but also because they can be (and probably are) scams.
2. I use Wikipedia for
EVERYTHING. If it's not in it, I don't use it. Period. I don't ever buy the hype, I research everything. If a product is not on Wikipedia, I research its ingredients.
3. If I can supplement with food, I do. I don't buy fads. I don't follow "gurus". I eat meat (when I can), sugar (as of late, less than 1 Lb. a day, but normally almost 2), fat, etc. If I'm in doubt, I check the Wikipedia page for it.
4. I don't trust ANY site, no matter how reputable it may be, that would provide any data regarding my health. I go to the basics, always.
5. I don't subscribe to any diet,
EVER. I try to eat varied food, as much as my wallet will allow.
6. I
use my head, always. It's there, anyway.
For example: some time ago, companies started marketing cooking oil as "cholesterol free". From the get go, that sounded ridiculous to me (cooking oil is vegetable oil, and cholesterol is an animal derived alcohol), but quite a lot of people fell for it. From then on, a whole "cholesterol free" market was born. Cholesterol free potato chips, cholesterol free cheetos, cholesterol free pop corn. All things that were naturally cholesterol free to start with.
I spent almost a decade trying to reason with people about it. Then, the Justice department mandated that any "cholesterol free" advertising was forbidden because "while not misleading per se, it implies a misleading concept".
Same happens with "diet" stuff, "fat-free", you name it. People don't want to eat sugar, and will gladly take aspartame, saccharin, and a bunch of other sweeteners (all known carcinogens) in its place. They don't want to use salt (sodium chloride) because it's unhealthy, and instead use sea salt (a known poison) to substitute it.
7. I don't fall for the "natural" bullshit. Hemlock is natural. So is curare, nicotine, opium, etc.
8. For the same reasons, I don't fall for the "if it's hard to pronounce, it's bad" bullshit. Some years ago, the Skeptic Society (
https://en.wikipedia.org/wiki/The_Skeptics_Society) launched a meme that listed a bunch of chemicals, all with very difficult names, saying "Don't eat this!" on top. Below the list, it said: Do you know it? It's a
BANANA.