Dr. Stacy Sims

But it's one of the biggest reasons bone health is one of the...

most acceptable medical reasons for why we should put younger women who have low estrogen time periods onto estrogen treatment because it can so profoundly change their bone health long term.

It's like the sacrifice of other things.

It's like we said about Pilates.

If all you do is running, then that is definitely not the best way to be.

It's not the healthiest for your whole body.

It's not that you're unhealthy, but we're really talking about how are we optimizing your body and your hormonal health for a variety of different goals.

Yeah.

But also, if we look very micro at running, 58% of runners have a luteal phase defect.

That means that the second half of their menstrual cycle is not going to be able to last as long as we want it to, likely due to what Stacey was talking about earlier, this

relative energy deficiency coming back to the brain.

The brain signals it not as strong to keep that corpus luteum, what happens after the follicle, alive.

And a lot of women, I still have my period, so I'm okay.

But if we're using our cycle as a vital sign, we can actually say the ratio of energy balance is not great.

And it's often because we're doing it at sacrifice of other things.

So if you're doing the strength training three times a week,

And you're running however you're spacing out your other days.

That's such a healthy balance.

It's hard that you're going to be in a bad position with that.

These were episodic stresses.