A Little More Color, A Little More Variety

The advice to "eat more vegetables" is usually interpreted as a call for quantity. Recent data suggests otherwise: variety matters too — how many different plants make their way into your diet, not just how many grams.

What the Evidence Says

The WHO recommends a minimum of 400 g of fruits and vegetables per day — this is a baseline guideline for quantity.

When it comes to variety, the American Gut Project (McDonald et al., 2018) is often cited — a large population study on microbiota. It found that people consuming more than 30 different plants per week had a noticeably more diverse gut microbiome than those consuming fewer than 10. This is an observational study: it shows a correlation but does not prove causation.

Importantly, here "plants" do not refer only to vegetables. Fruits, grains, legumes, nuts, seeds, herbs, and spices all count.

How to Add Variety with Ease

Thirty items a week sounds like a lot until you start counting:

• A mix of grains instead of one — buckwheat, pearl barley, bulgur throughout the week.
• Greens and spices also count: dill, parsley, basil, cinnamon, turmeric.
• Frozen vegetable mixes — often containing 4–5 plants in one package.
• A handful of mixed nuts and seeds instead of one type.
• Sauerkraut, pickles, homemade preserves — a seasonal way to add variety.

It Works the Same in Winter

Fresh vegetables are more expensive and taste worse in winter — this is not a reason to limit variety. Frozen vegetables retain most nutrients because they are frozen right after being harvested. Root vegetables, cabbage, legumes, and grains together provide a fairly wide array without seasonal compromises.

In Brief

• WHO: at least 400 g of fruits and vegetables per day.
• American Gut Project: consuming over 30 different plants per week is linked to a more diverse microbiome.
• Grains, legumes, nuts, greens, and spices also count.
• Frozen vegetables are a great option, especially in winter.

This is general information about nutrition and habits, not medical advice. If you are pregnant, breastfeeding, taking medication, or have a chronic condition — discuss dietary changes with your doctor.