system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why is it smarter to eat fruits and veggies than to instead take a multivitamin and fiber supplement?

It'd be cheaper for me and I'm about to start a cut phase for lifting, and I'm assuming it's smarter to eat fruits and veggies than... Well I assume you read the title.
gpt
While we've discovered and studied a number of compounds that are important to our bodies and classified them as "vitamins" and estimated how much you should eat, the reality is that our bodies and our diets are much more complex. A vegetable contains thousands of different compounds, and we still don't understand what sorts of benefits our bodies might get from many of them. Basically, edible plants are more than just the list of vitamins and minerals you might read on a nutritional label. There's a ton of other stuff in there that our biology evolved along side of.