Why Your Metabolism Slows After 40 — and What Helps

Key Developments:
- Dietitians caution that some common “healthy” habits after age 40 may unintentionally reduce metabolic efficiency by contributing to muscle loss.
- Experts recommend prioritizing strength training, adequate protein intake, balanced carbohydrates, quality sleep, and stress management to support long-term metabolic health.
- Recent expert reviews emphasize that preserving muscle mass—not extreme dieting—is one of the most effective ways to maintain metabolism as people age.
(EatingWell) — July 6, 2026: As more adults seek healthier lifestyles after the age of 40, nutrition experts are cautioning that some popular diet and fitness habits may unintentionally work against metabolic health. Recent expert analysis suggests that preserving muscle mass through balanced nutrition and resistance training may be more beneficial than relying on restrictive diets or exercise trends alone.
Metabolism refers to the body’s process of converting food into energy for essential functions. While metabolic rate generally remains relatively stable through much of adulthood, experts note that age-related muscle loss often begins in the 30s, making muscle preservation increasingly important for maintaining energy expenditure.
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According to a report published by EatingWell, one common mistake is consuming overly low-calorie meals in an effort to lose weight. Registered dietitian Elizabeth Ward explained that severe calorie restriction may reduce protein and carbohydrate intake needed to maintain lean muscle.
CREDIT: MyDiagnostics
“If you’re gaining weight after 40, it makes sense to think that cutting way back on calories at meals and snacks would be helpful. However, this can lead to under-eating that can make it difficult or impossible for your body to make new skeletal muscle cells,” Ward said.
The report also highlights that relying exclusively on cardiovascular exercise without resistance training may contribute to further muscle loss over time. While aerobic exercise supports heart health, experts recommend combining it with regular strength training to help preserve lean body mass and support healthy metabolism.
Another habit discussed is eliminating carbohydrates entirely. Nutrition specialists note that while reducing refined carbohydrates may help some individuals manage blood sugar and weight, completely removing carbohydrates from the diet can also reduce intake of dietary fiber, vitamins, minerals, and other nutrients important for overall health. Balanced consumption of whole grains, fruits, vegetables, and legumes remains the preferred recommendation.
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The report further examines intermittent fasting, explaining that although it has shown potential metabolic benefits in some studies, it may become challenging for certain individuals—particularly women during perimenopause and menopause—to consume sufficient protein within a restricted eating window.
Registered dietitian Jaime Shelbert advised: “If you choose to practice intermittent fasting, focus on adequate protein, strength training and an earlier eating window, plus consider whether it is a sustainable approach that fits your lifestyle.”
CREDIT: PalomaHealth
Experts also recommend several daily habits to support metabolic health after 40, including consuming adequate protein throughout the day, obtaining seven to nine hours of quality sleep, managing chronic stress, and increasing everyday physical activity in addition to structured exercise. Activities such as walking, climbing stairs, and household chores contribute to non-exercise activity thermogenesis (NEAT), which can increase daily energy expenditure.
Recent expert reviews published in early July similarly emphasize that maintaining muscle mass through resistance training and adequate nutrition is more effective for long-term metabolic health than following highly restrictive diets or relying solely on cardio exercise. Researchers also note that metabolism is influenced by multiple factors—including age, body composition, physical activity, sleep, genetics, and overall dietary patterns—rather than a single food or lifestyle habit.
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