Weight gain is common during menopause, but new research suggests dietary patterns can influence how much weight people gain during this transition. A team from Harvard and the National University of Singapore analyzed data from the Nurses’ Health Study II—more than 38,000 women followed for about 12 years (six years before and six years after reported menopause)—and published results in JAMA Network Open. They found that diets emphasizing plant foods and minimizing processed meats, salty snacks, and ultra-processed foods were associated with smaller weight increases and lower odds of developing obesity.
What the study looked at
– Participants completed detailed food questionnaires every four years. Researchers scored diets using 11 different dietary patterns, including the Mediterranean diet, DASH, plant-based approaches, and the Planetary Health Diet (which emphasizes sustainability and heart-healthy choices). They also assessed indices that reflect a diet’s potential to raise insulin and measured intake of ultra-processed foods.
– Weight was self-reported every two years; researchers calculated annual weight change and tracked who developed obesity. Analyses adjusted for age, race, income, physical activity, smoking, hormone therapy, and baseline weight.
Key findings
– Women whose diets were richer in fruits, vegetables, whole grains, nuts, and legumes—and lower in red and processed meats, fried snacks, and salty foods—gained less weight during the menopausal transition.
– Diets with lower insulin-raising potential (measured by the Empirical Dietary Index for Hyperinsulinemia) were linked to the smallest weight gains and the lowest obesity risk. Foods that tend to spike insulin—such as processed meats, salty snacks, and fried potatoes—were associated with greater weight gain.
– The Planetary Health Diet showed the strongest protection against obesity in this study. It prioritizes plant proteins, healthy fats, whole grains, and a variety of fruits and vegetables, while limiting red meat and refined carbohydrates.
– High intake of ultra-processed foods and sugary drinks was associated with more weight gain and higher obesity risk.
– Not all low-carbohydrate diets behave the same: low-carb patterns based on vegetable proteins and unsaturated fats were linked to less weight gain, whereas low-carb diets high in animal fats and proteins were linked to more.
Why plant-forward diets may help during menopause
– Metabolism often slows and body fat distribution shifts with declining estrogen, making weight management harder. Plant-forward diets tend to be lower in calorie density and higher in fiber and water, which helps people feel full on fewer calories.
– Fiber slows digestion, increases satiety, and is fermented by gut bacteria into short-chain fatty acids that may help regulate appetite hormones and gastric emptying.
– Plant-rich diets support greater gut microbiome diversity and beneficial bacteria, which is associated with better metabolic health and lower inflammation.
– These diets are typically lower in saturated fat and may improve insulin sensitivity. They are also linked to lower production of TMAO, a compound formed from compounds in meat that has been associated with cardiovascular risk.
– Higher plant-to-animal protein ratios were associated with better preservation of lean mass in menopausal women in other studies.
Practical tips for adopting a plant-forward approach
– Add before you subtract: start by increasing fruits, vegetables, whole grains, legumes, nuts, and seeds rather than immediately cutting out animal foods. Small changes can bring benefits.
– Start with foods you already like—many common foods are plant-based (pasta, potatoes, bananas, peanut butter, etc.). Experiment with new plant dishes at restaurants to find options you enjoy, then recreate them at home.
– Use herbs, spices, and a variety of preparations to enhance flavor and make plant meals more satisfying.
– Be mindful of processed plant-based alternatives: they can be useful but may be highly processed and calorie-dense if eaten in excess. Focus on whole-food sources first.
– If following a fully plant-based diet, consider supplements or fortified foods for vitamin B12 and, if needed, vitamin D. Pay attention to calcium, iron, and zinc intake and seek dietary strategies (or supplements) to meet needs.
– If you want tailored guidance, consult a registered dietitian who can help design a sustainable eating plan that meets nutrient needs and supports weight and metabolic health.
– Joining a support group—local or online—can help with recipe ideas, product recommendations, and motivation.
Bottom line
For many women, shifting toward a plant-forward pattern—emphasizing whole fruits, vegetables, whole grains, legumes, nuts, and healthy fats while limiting processed meats, fried snacks, salty foods, and ultra-processed products—appears to help limit weight gain and lower obesity risk during the menopausal transition. Small, sustainable changes and professional support when needed can make this approach practical and effective.