Can you really control SHBG to optimize testosterone therapy?

What did @drsabrinadnp actually say?

The video pitches a set of lifestyle habits as a way to "increase your SHBG" and get "the most of your testosterone therapy." The advice includes eating three to four meals a day with no snacking, hitting "30 to 50 grams of protein in every single meal," walking 10 minutes after meals, and screening for sleep apnea if sleep is poor. The video ends with a direct-to-DM patient recruitment pitch.

To be fair, none of these suggestions are quack medicine. They are real metabolic health interventions. But the framing has a significant problem: the creator conflates low SHBG with poor metabolic health, then reverse-engineers dietary advice as if raising SHBG is the goal. That logic needs unpacking.

Does the science back this up?

Partially, but the mechanism is being oversimplified in ways that could mislead patients. SHBG is not simply a metabolic readiness signal. It is a glycoprotein produced by the liver, and its levels are shaped by insulin, thyroid hormones, estrogen, liver function, and genetics, among other things.

The claim that low SHBG means "your body doesn't have the metabolic health to use it properly" is a loose interpretation. What the research actually shows is that hyperinsulinemia suppresses hepatic SHBG production. A 2010 paper by Ding et al. in Diabetes Care confirmed that higher fasting insulin is independently associated with lower SHBG in both men and women. So yes, improving insulin sensitivity through diet and movement can raise SHBG. That part is supported.

Walking after meals has real data behind it. A 2022 meta-analysis by Buffey et al. in Sports Medicine found that short post-meal walks meaningfully reduced postprandial blood glucose and insulin spikes. If insulin is suppressing SHBG, reducing postprandial insulin load is a reasonable strategy. That said, the creator presents this as a direct SHBG fix rather than an indirect metabolic benefit, which is a meaningful distinction.

What did they get wrong (or right)?

The sleep apnea recommendation is genuinely good clinical advice that does not get mentioned enough in TRT content. Obstructive sleep apnea is both a cause and consequence of hormonal dysfunction, and it is underdiagnosed in men on testosterone therapy. Full credit there.

Where the video goes wrong is the protein math. Recommending "30 to 50 grams of protein in every single meal" across three to four meals means a daily intake of 90 to 200 grams. The upper end of that range is not evidence-based for SHBG optimization specifically, and it is an unusually wide range to throw at a general audience without context on body weight or kidney function. For a 150-pound person, 200 grams of protein daily exceeds most sports nutrition recommendations without clear added benefit.

The claim that not hitting that protein target means "you're getting way too many carbs and way too much fat" is also a logical jump. Macronutrient distribution is not that binary. A person eating whole food carbohydrates and healthy fats with moderate protein is not necessarily hurting their SHBG or their testosterone response.

What should you actually know?

If you are on testosterone therapy and your free testosterone looks good on labs but you still feel symptomatic, SHBG is worth investigating. Low SHBG does correlate with insulin resistance and visceral adiposity, and lifestyle interventions targeting those root causes are a reasonable first line of action before adjusting your TRT protocol.

But SHBG optimization is not a one-size-fits-all target. Some individuals genetically run low SHBG without metabolic disease. Others have low SHBG because of thyroid dysfunction, liver conditions, or exogenous androgen use itself. Testosterone administration can suppress SHBG directly, which is a pharmacological effect, not a metabolic failure. A 2016 review by Hammond in Endocrine Reviews outlines how exogenous androgens reduce hepatic SHBG synthesis independent of insulin.

The lifestyle advice here is not harmful. Walking after meals, eating adequate protein, sleeping well, and avoiding blood sugar spikes are all defensible recommendations. The problem is the confident causal framing. Doing these things may raise SHBG modestly in some patients. They are not a guaranteed fix, and they do not replace a proper clinical workup.