"Beans, beans, the wonderful fruit,
The more you eat, the more you toot.
The more you toot, the better you feel.
Let's have beans at every meal!"

I've wondered if there's a table of relative levels of wind generation among bean varieties, although method of preparation and time and temp of cooking alter the bases for comparison. I believe it to be demonstrable that dried beans are windier than fresh or frozen. "Soaked" beans seem to be windier than beans cooked long and slow without pre-soaking. Mexicans, especially those from Northern states, often add a local herb, "Epazote" to beans, partially to diminish gas production.

"Greens"?
I'll agree in the case of boiled or steamed cabbage and Brussels sprouts (to which fresh in any fashion other than boiled or steamed I'm addicted). Boiling/steaming seems hasten and increase the the organic process which hastens and increases the production of hydrogen sulfide in leafy vegetable with a noticeable sulfur content.

Personally, Cantaloupe and peanuts.

Quote: "overly-spicy"
Not that I've ever noticed in decades of addiction to foods which cause my forehead to sweat and my nose to run like the proverbial faucet....

Quote: "It also depends a lot on the water you drink. If you use your local potable water - if it on the harder side - flatulence is noticeably more..."
If I saw a PhD in Biochemistry, Food Science, etc. or evidence of your gastroenterology residency, I might find the statement more credible. Living in the land of "Hard" water, and having spent enough time in some of the parts of Texas where "Sulfurous" is an apt description of the local well water and its taste (and a few locales where the supply from the tap borders on "Gyppy"), I've never felt "hard" water to be much of a gas generator. Now, back in yesteryear, the minerals in the Mexican bottled water "Tehuacan" could generated a mild version of "Montezuma's Revenge" among tourists who thought that safety lay in bottled water and only the "Con gas" versions were provably safe from having been refilled from the tap in the alley. There was some gas propelling the eruptions....