Gut health for men over 40 sounds like something your wife’s podcast covers, not something a lifter needs to think about. Stay with me for four minutes. This one finding changed how a lot of coaches talk about nutrition — and it has nothing to do with kombucha.
The Finding
The American Gut Project — one of the largest microbiome studies ever run, with samples from thousands of participants across the US, UK, and Australia — found that the single strongest dietary predictor of a diverse, healthy gut microbiome wasn’t whether people were vegan, keto, or paleo. It was the number of different plant foods they ate per week. People who ate roughly 30 or more distinct plants weekly had significantly more diverse gut bacteria than people who ate 10 or fewer — regardless of which diet camp they belonged to.
Not more vegetables. More kinds of plants. Beans, oats, nuts, coffee, herbs, salsa — all of it counts.
The Mechanism
Here’s the WHY, in plain English. Different gut bacteria eat different fibers. Feed them one or two fiber types on repeat — the classic dad rotation of rice, bread, and the same three vegetables — and you’re running a monoculture down there. Feed them thirty different plants and you’re funding a full workforce.
That workforce matters because those bacteria ferment fiber into short-chain fatty acids, chiefly butyrate. Butyrate is the preferred fuel for the cells lining your gut wall. A well-fed gut lining keeps the barrier tight, which keeps low-grade inflammation down. And chronic low-grade inflammation is the quiet tax on everything you care about after 40: recovery between sessions, joint comfort, energy at 3 PM when your kid wants to wrestle and you want the couch.
You’re not eating plants to be virtuous. You’re eating variety to keep the inflammation tax low and the recovery engine running.
The Action
Don’t overhaul anything. Run a count.
This week, tally every distinct plant you eat. Spices count. Coffee counts. The onions in your chili count. Most guys land between 10 and 15 and think they’re eating “pretty healthy.”
Then close the gap the lazy way: a mixed-nut bag instead of one nut type, a four-bean chili instead of one, two extra frozen vegetables thrown into whatever’s already cooking, berries on the oatmeal. Ten new plants a week without a single new recipe. That’s a system, not a diet.
Track It Like a Lift
You track your squat because what gets measured gets built. Same rule here. Log your meals in the Dadzilla App for one week and count your distinct plants — the nutrition log makes the tally honest, because “I eat plenty of vegetables” and the actual number are rarely the same thing.
Thirty plants. One week. Count them like reps.
Open nutrition logging in the Dadzilla App →
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