Ever looked into someone else’s grocery cart and made a quick assessment of how healthy they are? Of course you have. Don’t we all? You notice unhealthy contents like cereal, chips, ice-cream, boxed meals. Or maybe you notice healthy contents, like fresh veggies, fruit, organic foods. And maybe you glance at the person pushing the cart, and quietly build a story. A little savage? Probably. But a grocery cart can tell a story.
Yours does too. The same cereal. The same spinach. The same snack. The same fruit packed for work. The same dinner ingredients bought every week. You make a habit of buying your same items, because familiar foods make life easier. They save time, reduce waste, and remove decisions from an already busy day. But when it comes to the gut microbiome, a little less predictability can be useful and is probably the better “healthy” choice.
Variety Matters More Than Perfection
Your gut tends to benefit from a broader range of plant foods because different plants provide different types of fiber, resistant starches, and plant compounds. Those compounds become part of the environment your gut microbes live in and use.
That doesn’t mean you need an expensive diet, unusual ingredients, or a refrigerator full of foods nobody in your house wants to eat. And “plant foods” does not mean you are going to be stuck with a diet made up entirely of salads and vegetables. The goal is variety, not perfection.
One practical target that has received a lot of attention is 30 different plant foods a week. That number comes largely from the American Gut Project, a large citizen science microbiome study involving more than 10,000 participants. Researchers found differences in the gut microbial communities of people who reported eating more than 30 different types of plants per week compared with people who ate 10 or fewer.
Now 30 isn’t a magic number. Eating 29 plants doesn’t suddenly become inadequate while 30 transforms your microbiome. The broader point is that a greater variety of plant foods may provide your gut microbes with a wider range of material to work with.
Research also continues to show that different dietary fibers affect the gut microbiome in different ways, and that responses can vary considerably from person to person.
“Plants” Does Not Mean 30 Vegetables
If that were true, very few of us would ever choose this as a way to improve gut health. And even if we did, it really isn’t sustainable. So what does it mean then?
Plant diversity obviously includes lettuce, broccoli, carrots, and whatever else lives in the produce section. But that is only part of it.
Plant foods also include:
• Fruit
• Beans
• Lentils
• Whole grains
• Nuts
• Seeds
• Herbs
• Spices
Oats, brown rice, and chickpeas count. So do walnuts, chia seeds, garlic, cinnamon, parsley, basil, and cumin.
Once you understand what constitutes a plant food, 30 plant foods over seven days sounds considerably less ridiculous.
So What Actually Qualifies as a Plant Food?
A simple way to think about it is that if it is a plant, or comes directly from a plant, it probably counts. You just might not have ever thought about it before.
And if you’re going to try and get 30 plant foods into your week, just know that different plants count separately. Black beans and chickpeas are two separate varieties, as are walnuts and almonds, and strawberries and blueberries.
Where this becomes less useful is with highly refined ingredients that technically began as plants but no longer resemble the original food. Sugar comes from plants, for example, but nobody should be adding another plant to their weekly total because they ate a cookie that has sugar as an ingredient.
The better question is not “Can I technically trace this ingredient back to a plant?” It is “Am I eating another or different fruit, vegetable, whole grain, bean, lentil, nut, seed, herb, or spice?” If the answer is yes, count it. And remember, this is not meant to become another nutrition scorecard. The 30 plant idea is a practical way to think about variety, not a rigid mathematical system.
You May Already Be Closer Than You Think
Consider an ordinary breakfast of oats with raspberries, walnuts, ground flaxseed, and cinnamon. That is five plant foods.
Lunch might be a bowl with greens, black beans, corn, avocado, tomatoes, and lime. Another six.
Dinner might include quinoa, broccoli, carrots, onion, garlic, and parsley. Another six.
Without trying particularly hard, you are already looking at 17 different plant foods in one day, assuming little overlap. None of those meals requires a specialty grocery store, a complicated recipe, or a degree in nutrition. The benefit comes from the range across the week.
Don’t Replace Your Diet. Rotate It.
The easiest way to eat a wider range of plants is not to reinvent every meal. Keep what already works. Then rotate one or two things in or out. If apples are always in the house, buy pears, oranges, or berries next week. If black beans are the pantry staple, try chickpeas, lentils, or white beans occasionally. If rice is your usual grain, bring home barley, quinoa, oats, or cornmeal. If broccoli appears every week, add cabbage, cauliflower, green beans, squash, or sweet potatoes.
You get the idea. You see repetition is not inherently a problem. The point is simply to make room for a little more variety alongside the foods you already like. Herbs and spices may be one of the easiest ways to do this. Fresh parsley changes a grain bowl. Ginger changes a stir fry. Cumin changes beans. Cinnamon changes breakfast. Small additions still contribute to a broader dietary pattern.
Make Variety Convenient
A more diverse grocery cart shouldn’t create more work or make you go crazy trying to figure out a substitute. And you don’t want to have to worry too much about how foods are packaged. Fruits and vegetables still count if they are frozen. Beans and lentils still count if they are canned. A jar of salsa, a bag of greens, a different herb, or a new fruit can add variety without adding much effort.
One simple approach is to keep your usual grocery list, then add:
• One fruit you did not buy last week
• One vegetable you have not had recently
• One bean or grain that is not part of your usual rotation
• One herb, spice, nut, or seed that changes things up
That’s really it. That’s enough. Over time, those small changes create a wider dietary pattern without turning grocery shopping into another project.
Your grocery cart does not need to look perfect. It just needs to become a little less predictable. Your gut may be better for it.
References
McDonald D, et al. American Gut: an Open Platform for Citizen Science Microbiome Research. mSystems. 2018.
Delzenne NM, et al. The gut microbiome and dietary fibers: implications in health and disease.
