Why Eating 30 Different Plants Weekly Could Transform Your Gut Health

A growing number of health experts now recommend eating at least 30 different plants each week. This approach, backed by research, aims to improve gut health by boosting the diversity of the microbiome. The idea has gained traction through books like 30 Plants a Week, written by both Sarah Wilson and Katharina Seiser in 2024.

The concept stems from studies like the American Gut Project, which found that a varied plant-based diet supports a healthier microbiome. This community of gut bacteria plays a key role in digestion and may even influence taste preferences—sometimes shifting in just six weeks.

Professor Tim Spector, a leading researcher, suggests aiming for 30 different plants weekly. However, some experts argue for 40 or more. The guideline remains flexible: a 'good handful' of vegetables, fruit, legumes, or whole grains counts, as does half a teaspoon of spice. Heavily processed plant-based foods, though, do not qualify. Katharina Seiser, author of 30 Plants a Week, adopted the diet herself after realising she rarely ate whole grains. Her book offers practical tips for incorporating more plant variety into meals. Meanwhile, Sarah Wilson's 2024 guide of the same name provides additional strategies for achieving the weekly target.

The '30 plants per week' rule encourages small, manageable changes to improve gut health. Research shows that even minor dietary shifts can alter the microbiome, potentially leading to long-term benefits. With flexible guidelines and practical advice now available, the approach has become more accessible to those looking to diversify their diets.