Weight gain during menopause is not due to women eating more. It results from a metabolic shift with specific biological causes, and the standard advice to eat less and move more is not always the answer.
On average, women gain two to five kilograms during the menopausal transition. Most of this accumulates around the abdomen, regardless of what they eat or how much they exercise.
They are told that this is normal. They are told to eat less, move more, and accept that their bodies are changing. This advice fails most women who follow it. Not because they lack discipline, but because it addresses the wrong problem.
Weight gain in menopause is driven by specific biological mechanisms that cannot be reversed by calorie reduction. Understanding these mechanisms is the only way to effectively address them.
What Estrogen Does to Fat Distribution
Estrogen directly influences where fat is stored in the female body. When levels are sufficient, it preferentially directs fat storage to peripheral areas such as the hips and thighs.
As estrogen levels decline in perimenopause and drop sharply during menopause, this distribution changes. The body begins to store visceral fat instead, which is fat around the internal organs in the abdominal cavity.
Visceral fat differs not only in appearance from fat elsewhere. It is metabolically active tissue: it produces pro-inflammatory messengers, disrupts hormonal signaling pathways, and independently worsens insulin resistance.
This creates a cycle that dietary changes alone cannot break. This is because diet addresses the inflow, not the mechanism driving storage.
The Insulin Resistance That No One Explains
The most important metabolic change behind menopausal weight gain is insulin resistance. And it is almost never clearly explained to affected women.
Insulin is the hormone that signals cells to take glucose from the blood and convert it into energy. If cells become insensitive to this signal, glucose is no longer used efficiently but is directed to fat storage, especially visceral fat.
This is not primarily a result of too much sugar. It is the result of cells no longer producing energy efficiently. And this problem has its roots in NAD⁺ decline.
NAD⁺ is needed for the signaling pathways through which insulin controls glucose uptake in muscle cells. As NAD⁺ levels decline in the 30s and 40s, these signaling pathways respond less effectively. Insulin resistance develops, which is exacerbated by the hormonal changes of perimenopause.
The result is a body that stores fat more easily, burns energy less efficiently, and responds less and less to dietary changes because the underlying metabolic mechanism remains untouched.
NMN supplementation significantly increased muscle insulin sensitivity in postmenopausal women with prediabetes. This opens up possible approaches for age-related metabolic disorders that disproportionately affect postmenopausal women.
— Yoshino et al., 2021
What Research Has Found Regarding NAD⁺ Restoration
In 2021, researchers from Washington University School of Medicine published a randomized, placebo-controlled, and double-blind study in the journal Science. Postmenopausal women with prediabetes were examined – the group in which both NAD⁺ decline and insulin resistance are most advanced and best measurable.
After ten weeks of daily NMN intake, participants showed significantly improved muscle insulin sensitivity. Additionally, the activity of genes involved in the structure and remodeling of muscle tissue increased.
This is the first human study to show that NAD⁺ restoration through NMN leads to measurable improvements in precisely the metabolic disorder that drives weight gain during and after menopause.
Another study from 2021, published in the Journal of the International Society of Sports Nutrition, found significantly improved oxygen utilization and endurance performance with NMN in amateur runners. This is supported by the same improvement in mitochondrial efficiency, which also determines how well the body burns energy at rest.
Mitochondrial function and metabolic rate are directly related, and both decline with NAD⁺ levels. Therefore, research on physically active groups is also relevant for the metabolic health of women who are not athletes.
What Measures Really Work and Why
The measures with the best evidence base for weight during menopause have one thing in common: they improve metabolic efficiency and insulin sensitivity, instead of just reducing calorie intake.
Strength training is best proven. It builds and maintains muscle mass. Muscle is the most important site of insulin-mediated glucose uptake and also the tissue most directly affected by NAD⁺ decline and menopausal muscle loss.
Sufficient protein, about 1.6 to 2 grams per kilogram of body weight daily, supports muscle maintenance and produces a lower insulin response than a carbohydrate-heavy diet.
Regular endurance exercise improves mitochondrial function and insulin sensitivity over time.
These measures work because they address the metabolic mechanism and not just the calorie balance.
NAD⁺ restoration through NMN works with them because it improves the cellular conditions under which they can function at all. Better mitochondrial function means that strength training triggers a stronger metabolic adaptation. Better insulin sensitivity means that the same eating choices lead to less fat storage.
Research does not advocate for using NMN instead of these fundamentals. It advocates for using it as a supplement to restore the cellular environment in which these fundamentals work as they should.
What to Realistically Expect
Losing weight is slower during menopause than in younger years. And regaining pre-menopausal weight is often less realistic and less useful as a goal than achieving better metabolic health, better body composition, and greater physical performance.
The crucial metric is not the scale. It is the development of visceral fat, insulin sensitivity, and physical resilience over months.
Women who combine strength training, sufficient protein, good sleep, and NAD⁺ restoration consistently report: the resistance diminishes over time, and the body reacts to exertion as it used to.
This is not a dramatic transformation. It is a metabolic environment shifting back into a functional state. And this is exactly what the biology of NAD⁺ restoration in postmenopausal women suggests.
Weight gain during menopause has specific biological causes. And there are specific measures for these causes. Women who address the causes directly achieve results that are not seen with general dietary advice. The difference is not in discipline. It is in understanding the problem before trying to solve it.
Sources
- Yoshino, M., Yoshino, J., Kayser, B. D., et al. (2021). Nicotinamide mononucleotide increases muscle insulin sensitivity in prediabetic women. Science, 372(6547), 1224–1229. https://doi.org/10.1126/science.abe9985
- Liao, B., Zhao, Y., Wang, D., et al. (2021). NMN supplementation enhances aerobic capacity in amateur runners. JISSN, 18(1), 54. https://doi.org/10.1186/s12970-021-00442-4
- Covarrubias, A. J., Perrone, R., Grozio, A., & Verdin, E. (2021). NAD+ metabolism and its roles in cellular processes during ageing. Nature Reviews Molecular Cell Biology, 22(2), 119–141. https://doi.org/10.1038/s41580-020-00313-x
- Massudi, H., Grant, R., Braidy, N., et al. (2012). Age-associated changes in oxidative stress and NAD+ metabolism in human tissue. PLOS ONE, 7(7), e42357. https://doi.org/10.1371/journal.pone.0042357
- Imai, S. I., & Guarente, L. (2014). NAD+ and sirtuins in aging and disease. Trends in Cell Biology, 24(8), 464–471. https://doi.org/10.1016/j.tcb.2014.04.002
- Kim, M., Seol, J., Sato, T., et al. (2022). Effect of 12-week intake of NMN on sleep quality, fatigue, and physical performance. Nutrients, 14(4), 755. https://doi.org/10.3390/nu14040755