science

I'm not down.
That person was advocating vegetarianism, although the word wasn't mentioned once in the article. In fact, they even addressed the nutritional and social challenges of vegetarianism, while avoiding the word entirely. Written as such, the article is less than honest. It's a clickbait tactic.

Here's the rules. (Edit - This is baisc nutrition, not a summary of the article. I differ from the author in that I would never advocate vegetarianism.)

• Eat food. - Not supplements. Not processed crap. Eat things that can be clearly identified as food.
• Mostly plants. - Ya, your diet is probably upside down. Have one slice of the roast. Eat a heap of veggies. Start eating beans regularly.
• Not too much. - This issue goes away when you start eating a lot of natural fiber. You're less hungry. People start asking 'what's your secret'.