Ask any random gym-goer what oestrogen does in a man, and you often hear: nothing good, keep it as low as possible. That idea is stubborn and largely wrong. Oestrogen, and specifically estradiol, is a working part of a healthy male body. Without enough of it you perform worse, not better.
Here is the stance to remember: it is not about little oestrogen, but about the right ratio between oestrogen and testosterone. Too low is just as much a problem as too high, and you see both in your blood values and in how you feel.
Where male oestrogen comes from
Men make oestrogen mainly by conversion of testosterone via the enzyme aromatase, which is active in your fat tissue among other places. The end product is estradiol (E2), the most important form of oestrogen. The more fat mass and the more testosterone in circulation, the more raw material there is for that conversion.
That immediately explains why your testosterone and your estradiol are never to be read in isolation. Your SHBG plays in too, because it determines how much testosterone is freely available for conversion.
What estradiol does for you
Estradiol is not a by-product to clear away. It actively contributes to functions you notice directly as an athlete. The table below sets out the main roles, plus what can happen with too much or too little.
| Function | Role of estradiol | With a skewed balance |
|---|---|---|
| Libido and sexual function | Works with testosterone on desire and function. | Both too low and too high can dampen libido. |
| Bone density | Indispensable for strong bones, in men too. | Too low raises the risk of bone loss over time. |
| Joints | Helps keep joints supple. | Too low often gives dry, stiff joints. |
| Mood and sleep | Influences wellbeing and sleep quality. | Imbalance can bring low mood or poor sleep. |
| Fluid balance | Helps regulate fluid retention. | Too high can cause fluid retention. |
The striking thing: libido and mood worsen with both too low and too high estradiol. That is why you cannot estimate your oestrogen by feel. A measurement tells you in which direction your balance is off.
The guideline is clear about crushing it
Anyone who lowers estradiol aggressively, for example with an aromatase inhibitor without medical reason, risks exactly the complaints he thought he was preventing. The Endocrine Society warns in its guideline on testosterone therapy against routinely suppressing oestrogen, particularly because of bone loss. The Dutch College of General Practitioners (NHG) further places hormone diagnostics in men firmly in the context of complaints and a doctor, not in self-steering on loose numbers. In short: you lower estradiol only on indication and with guidance.
What your body fat does to your oestrogen
Because aromatase sits in large part in fat tissue, your estradiol relates to your body composition. More belly fat means more conversion of testosterone into oestrogen, and so often a higher estradiol value. That is one of the reasons why losing weight in men with overweight can shift their hormone profile favourably. It is also a lever you can influence yourself, without medication.
It works the other way too. Eating extremely low or chasing a very low body fat percentage can actually disturb your hormone balance. The message is not as low as possible, but healthy and balanced. The Netherlands Nutrition Centre (Voedingscentrum) stresses that a balanced diet and a healthy weight form the basis for your hormone balance, and that applies emphatically to your oestrogen too.
Why you never read estradiol alone
An estradiol value on its own says little. A number that fits one man fine can point to imbalance in another, simply because their testosterone and SHBG differ. That is why a doctor looks at the whole picture: how your estradiol relates to your testosterone, how much of that is freely available, and which complaints you experience. Only then does a number gain meaning. A table from the internet saying a certain estradiol value is too high misses exactly that context.
How to map your balance
Measure estradiol together with testosterone and SHBG, because it is the mutual ratio that matters. Do so preferably at a fixed point and place results side by side to see a trend. You get a complete hormonal picture with the general hormones panel.
If you use TRT, read estradiol on TRT and TRT monitoring. The basics of testosterone are in our pillar on testosterone and blood values.
A blood test does not make a diagnosis. Whether or not to intervene on your oestrogen you always discuss with your doctor.
Sources
- Endocrine Society. Testosterone Therapy in Men With Hypogonadism, Clinical Practice Guideline. endocrine.org
- Nederlands Huisartsen Genootschap (NHG), position on hormone diagnostics in men.
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Enhanced Health
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