A social-media trend encouraging people to eat 30 [1] different plant-based foods each week is gaining popularity to improve gut-microbiome diversity.

The challenge matters because research links greater plant-food diversity to a healthier gut microbiome, which is associated with better overall health [1, 2]. By diversifying intake, individuals may support a wider array of beneficial bacteria in their digestive systems.

Dietitians and researchers studying the gut microbiome have highlighted the trend, which gained widespread attention in early 2025 and continued through 2026 [1, 3]. The challenge includes a variety of fruits, vegetables, nuts, seeds, legumes, herbs, and spices.

“Eating a variety of plant foods feeds different strains of beneficial bacteria, which can improve gut health,” Gabrielle Morse, a dietitian, said.

Some data suggests the impact is significant. One study found that participants who consumed 30 or more plant foods per week had approximately 20% [4] higher gut-microbial diversity.

“The science shows that higher plant-food diversity is associated with greater microbial diversity in the gut,” a researcher said [1].

While the 30-plant target is the centerpiece of the viral challenge, some experts suggest the specific number is less important than the act of increasing variety. Some sources state that any increase in plant diversity is beneficial, rather than hitting the exact mark of 30 [5].

Other variations of the trend, such as the “triple 30” rule, expand the focus beyond the microbiome. These versions emphasize protein and fiber intake to support energy, mood, and digestion [3].

Despite the structured nature of the challenge, some users find the goal attainable. “I was surprised how easy it was to hit 30 different plants in a week,” an anonymous participant said [6].

““Eating a variety of plant foods feeds different strains of beneficial bacteria, which can improve gut health,””

The rise of the '30 Plants A Week' challenge reflects a broader shift toward personalized nutrition and microbiome science. While the specific number 30 serves as a gamified target for social media engagement, the underlying medical value lies in the diversification of prebiotic fibers. This trend suggests that dietary guidelines are moving away from rigid calorie counting toward the promotion of biological diversity within the human gut.