Two weeks ago I wrote about the Cochrane review that found TRT improved erectile function by 2.37 points on the IIEF scale versus placebo.
Most urologists would call that number modest at best.
Last week I wrote the balanced follow-up: for the small group of men with genuine hypogonadism, TRT does more than that. But for the average man walking into a TRT clinic with soft mornings and low drive, the numbers are underwhelming.
This week the Journal of Sexual Medicine published something that closes the loop.
A meta-analysis of 16 randomized controlled trials, 1,477 men, published June 2026. The question: what does diet and exercise actually do for erectile function?
The answer will change how a lot of men in their 40s and 50s think about their next move.
Source: https://academic.oup.com/jsm/article/23/6/qdag137
The number that matters
Across 16 trials and 1,477 men with erectile dysfunction, lifestyle change delivered a 2.35-point improvement on the IIEF-5 (95% CI 1.68 to 3.01, p < .00001). Moderate certainty evidence by GRADE.
Now compare that to the Cochrane TRT number: 2.37 points over placebo.
The two numbers are practically identical.
Lifestyle change produced the same magnitude of erectile function improvement as a lifetime prescription for exogenous testosterone.
No injections. No monthly billing. No prostate monitoring. No fertility suppression. No hematocrit checks.
Just food and movement.
Takeaway: The shortcut most men think they’re paying for delivers roughly the same result as what their body will do for free.
What actually worked
The researchers broke lifestyle change into three categories. All three worked.
Diet-only interventions. IIEF improvement of 2.16 points. Mediterranean diet, low-carbohydrate diets, and structured weight-loss programs all showed benefit.
Exercise-only interventions. IIEF improvement of 2.50 points. Aerobic exercise, resistance training, pelvic floor work.
Combined diet-and-exercise. IIEF improvement of 1.94 points, and the lowest between-study heterogeneity of any subgroup.
The paper tested for differences between the three approaches. There were none. Statistically, diet worked as well as exercise, and combining them didn’t obviously beat either one alone.
Takeaway: You can enter through the door you’ll actually walk through. Food or movement — pick the one you’ll do.
Who it worked for
This is the part that matters for men over 45.
The researchers ran subgroup analyses for age, BMI, baseline severity, intervention duration, and supervision status.
Every subgroup showed statistically significant improvement.
Men under 60: MD 2.56 points
Men over 60: MD 1.79 points
BMI under 30: MD 2.49 points
BMI over 30: MD 2.21 points
Mild ED at baseline: MD 2.70 points
Moderate-or-worse ED at baseline: MD 1.76 points
Under 3 months of intervention: MD 2.85 points
Longer than 3 months: MD 1.83 points
The paper found no evidence that any group did better or worse than another. Lifestyle change helped across the board.
Takeaway: Age isn’t a reason to skip this. Weight isn’t a reason. Severity isn’t a reason. The men who did it saw improvement regardless.
Why this works, biologically
Erectile function depends on four systems: vascular, metabolic, hormonal, and neural.
Diet and exercise touch all four.
Regular aerobic exercise increases vascular shear stress, which stimulates endothelial nitric oxide synthase — the enzyme that produces the same nitric oxide that Viagra amplifies. Better nitric oxide bioavailability means firmer erections through the same pathway the drug uses.
Mediterranean-style diets reduce oxidative stress and inflammation. Both damage endothelial cells over time. Cutting both preserves the vascular capacity your erections depend on.
Weight loss lowers systemic inflammation markers like C-reactive protein and interleukin-6. In men with metabolic dysfunction, these inflammatory markers correlate with worse endothelial function.
Exercise mobilizes endothelial progenitor cells — the cells your body uses to repair damaged blood vessels. Sedentary men have fewer of them. Active men have more.
And in men with obesity or metabolic syndrome, improved metabolic health raises testosterone naturally — often meaningfully.
Takeaway: This isn’t a placebo. It’s the same biology TRT tries to shortcut, running the way your body actually built it to run.
The exact protocol that produced the largest effect in the study. Why 3 months is enough for measurable results. The Esposito 2004 JAMA trial the researchers keep coming back to. And the one question worth asking yourself before you ever step into a TRT clinic.
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