Can a high protein diet and resistance training improve metabolic dysfunction?

Metabolic dysfunction is a broad term for problems in how the body handles fuel, including insulin resistance, poor blood sugar control, and trouble switching between burning fat and carbs. This last ability is called metabolic flexibility. Research suggests that two things can help: resistance training (strength training with weights or bands) and eating more protein. A 12-week study in older men found that resistance exercise improved metabolic flexibility, and a high-protein diet added further benefit ³. Reviews of liver-related metabolic disease also list resistance training and high-protein eating patterns as effective strategies ⁶. So the short answer is yes, but the size of the benefit depends on the person and how consistently the plan is followed.

What the research says

A 12-week randomized study of 33 healthy older men (average age 67) tested resistance exercise twice a week plus a high-protein diet of about 1.6 grams per kilogram of body weight per day, partly from whey protein supplements ³. Compared with no exercise, resistance training significantly improved metabolic flexibility, measured as the body's ability to shift fuel use between fasting, exercise, and after-meal states ³. The high-protein diet was linked to additional improvements in how the body used fuel during these transitions ³. This is direct evidence that the combination can change metabolic function, though the study was small and only in older men ³.

Muscle health matters a lot here. A 2025 review found that sarcopenia (loss of muscle mass and strength) is common in people with metabolic dysfunction-associated steatotic liver disease, affecting 20% to 40% of patients depending on how it is measured ⁷. Sarcopenia makes insulin resistance and inflammation worse, and it is an independent risk factor for liver scarring and poor outcomes ⁷. The same review notes that fat buildup inside muscle tissue, called myosteatosis, is also common and reduces muscle strength and metabolic efficiency ⁷. This helps explain why building and keeping muscle through resistance training could improve metabolic health.

A 2025 review of diet and lifestyle for fatty liver disease states that lifestyle intervention remains the cornerstone of management ⁶. It reports that weight loss of at least 5% reduces liver fat, at least 7% improves liver inflammation, and at least 10% can stabilize or reverse liver scarring ⁶. The review specifically names high-protein approaches and resistance training as effective for improving insulin sensitivity, reducing liver fat, and fighting muscle loss ⁶.

A 2026 trial in 54 overweight women aged 40 to 53 tested 8 weeks of resistance training three times a week combined with a high-protein diet, with or without omega-3 supplements ⁸. Both training groups lost body mass and fat mass and gained skeletal muscle mass, with better strength, endurance, and power than the non-training control group ⁸. Markers of muscle metabolism also improved in both training groups ⁸. This supports the idea that the combination works across different groups, not just older men. Other reviews point to related factors: ultra-processed foods may drive metabolic harm through their physical structure and fast absorption, not just their nutrients ², and physical inactivity itself promotes fat redistribution and inflammation ⁴. One review on exercise and stress proposes that repeated exercise bouts can recalibrate metabolic signaling when paired with enough recovery ¹, though it did not report measured outcomes.

What to ask your doctor

• Would a resistance training program be safe and appropriate for me given my current health and any joint or heart conditions?
• How much protein per day is right for my body weight, kidney function, and overall health?
• Are there specific metabolic markers (like blood sugar, insulin, liver enzymes, or cholesterol) we should track to see if my diet and exercise plan is working?
• Should I see a registered dietitian or exercise specialist to build a plan that fits my life and any barriers I have?
• How do my current medications or conditions affect what kind of exercise and protein intake is safe for me?