Menopause isn’t the start of weight gain, study suggests

Weight gain is often viewed as an unavoidable part of menopause, but new insight from a Mayo Clinic specialist suggests the biological groundwork for those changes is laid decades earlier.

Dr. Daniela Hurtado Andrade, an endocrinologist and obesity expert at Mayo Clinic in Jacksonville, says research shows that weight gain typically begins in early adulthood, long before perimenopause. One of the key drivers is a gradual decline in muscle mass that starts around age 30 — a natural part of aging that accelerates during midlife and menopause.

“As muscle mass decreases, metabolism slows down, which increases the risk of weight gain,” Hurtado explains. That metabolic shift makes it easier to gain weight and harder to lose it as women age.

The role of lifestyle

Modern lifestyles only compound the problem. Hurtado points to the widespread availability of processed foods high in sugar and fat, as well as technology that reduces everyday movement — from elevators and cars to long hours spent seated in front of screens. Together, these factors make maintaining a healthy weight more challenging even before hormonal changes enter the picture.

Understanding that physical changes start earlier may help women prioritize healthy habits sooner, Hurtado says. She recommends regular physical activity — at least 150 minutes per week — along with mindful eating practices such as tracking food intake and learning to recognize true hunger and fullness cues.

Protecting muscle mass is especially important. A healthy diet should include adequate protein, and exercise routines should incorporate resistance training and, when appropriate, high-intensity interval training. Hurtado notes this becomes even more critical during weight-loss efforts, since losing weight often also means losing muscle.

“One of the reasons people hit a weight-loss plateau is because they’re losing muscle mass, which slows metabolism,” she says.

More than diet and exercise

Even with strong lifestyle habits, Hurtado cautions that diet and exercise alone may not be enough for many people. The body is biologically wired to resist weight loss, interpreting calorie restriction as a threat to survival. While some individuals can maintain weight loss through lifestyle changes alone, many cannot due to the complex regulation of energy balance.

“For most people, the brain and body will push back against weight loss,” Hurtado said. 

As a result, long-term success may require additional tools, such as weight-loss medications, endoscopic procedures or bariatric surgery, alongside nutritional and behavioral support. Physical or occupational therapy may also help people find sustainable ways to stay active.

Hurtado encourages women — particularly in their early 40s or sooner — to begin conversations with their healthcare providers about age-related weight changes before they become more difficult to manage.

Focus on prevention

“Every doctor’s visit is an opportunity to focus on prevention,” she says. “Lifestyle interventions are the foundation, but there are tools that can help people stick with those changes.”

Central to that discussion, Hurtado emphasizes, is recognizing obesity as a disease with a biological basis.

“When people understand that weight problems are not a character flaw, it can completely change how they approach treatment,” she said. “That shift in perspective can be powerful — and it can improve outcomes.”