Dr. Stacy Sims

When we look tribally, I might get hit by some sociologists who are like, wait, this isn't completely true. But for the exception, there are some tribes that didn't fit into this. But for the general idea from a biological evolutionary standpoint.

when we had times of low calorie intake so we had to go find the beast or we had to go out and find calories it was at a disadvantage for the woman to be pregnant or to have a baby an extra mouth to feed so in times of low food intake the reproductive system or the endocrine system of a woman would wind down so she would become amenorrheic or lose her menstrual cycle for a while

when we had times of low calorie intake so we had to go find the beast or we had to go out and find calories it was at a disadvantage for the woman to be pregnant or to have a baby an extra mouth to feed so in times of low food intake the reproductive system or the endocrine system of a woman would wind down so she would become amenorrheic or lose her menstrual cycle for a while

But it didn't affect men in that same way because they had to lean up and get fitter and faster because they had to go fight the beast where they had to go find the calories and bring it back. So when we're looking from that evolutionary standpoint, in times of low calorie intake or low food intake, a woman's body will start to conserve and wind down because it thinks there's a famine coming.

But it didn't affect men in that same way because they had to lean up and get fitter and faster because they had to go fight the beast where they had to go find the calories and bring it back. So when we're looking from that evolutionary standpoint, in times of low calorie intake or low food intake, a woman's body will start to conserve and wind down because it thinks there's a famine coming.

But for men, they're not as sensitive and the body's like, oh, not a lot of calories coming in. That must mean there's a fight that I have to prepare for. So I'm going to lean up. I'm going to address all of my fuel systems so that I can tap into all these alternative fuel systems so that I will have the energy to be able to go and fight the beast to bring the calories back.

But for men, they're not as sensitive and the body's like, oh, not a lot of calories coming in. That must mean there's a fight that I have to prepare for. So I'm going to lean up. I'm going to address all of my fuel systems so that I can tap into all these alternative fuel systems so that I will have the energy to be able to go and fight the beast to bring the calories back.

So when there's adequate calories available, we see that women will lean up. they'll become more acutely aware, cognitive function comes up, carbohydrates are really important. So we see that there is a development of egg maturation.

So when there's adequate calories available, we see that women will lean up. they'll become more acutely aware, cognitive function comes up, carbohydrates are really important. So we see that there is a development of egg maturation.

We have better endocrine pulse, so that means that our hormones that pulse on a daily basis, they actually have the full pulse and return to baseline to encourage the body to have a really robust endocrine system. So that's thyroid, that's our menstrual cycle, it's all of the things. But when we start pulling the calories back, all that stuff winds down.

We have better endocrine pulse, so that means that our hormones that pulse on a daily basis, they actually have the full pulse and return to baseline to encourage the body to have a really robust endocrine system. So that's thyroid, that's our menstrual cycle, it's all of the things. But when we start pulling the calories back, all that stuff winds down.

So this is the big debate, right? So we look at fasting and we're at first... came out and was like, okay, we see that obese, sedentary individuals who had to lose weight rapidly for surgery, they're put on a fasting-type program. to lose weight quickly in order to survive surgery.

So this is the big debate, right? So we look at fasting and we're at first... came out and was like, okay, we see that obese, sedentary individuals who had to lose weight rapidly for surgery, they're put on a fasting-type program. to lose weight quickly in order to survive surgery.

And unfortunately, a lot of those times we look at clinical research and it gets transposed over to health and fitness without actually asking if it's viable. So then we look at the lower end of the fitness population, people who are just learning to move and wanting to move. And like, I also want to lose more body fat so that I can move better. Oh, I'll start fasting.

And unfortunately, a lot of those times we look at clinical research and it gets transposed over to health and fitness without actually asking if it's viable. So then we look at the lower end of the fitness population, people who are just learning to move and wanting to move. And like, I also want to lose more body fat so that I can move better. Oh, I'll start fasting.

And when we see a lot of the like push on it, it comes from male data again. So when we start looking at women and a lot of women used to come with their partners to see me and say, I don't understand. We're both doing the same kind of fasted training. He's leaning up and getting fitter. I'm putting weight on and getting slower. I'm like, okay, well, we have to separate it out, right?

And when we see a lot of the like push on it, it comes from male data again. So when we start looking at women and a lot of women used to come with their partners to see me and say, I don't understand. We're both doing the same kind of fasted training. He's leaning up and getting fitter. I'm putting weight on and getting slower. I'm like, okay, well, we have to separate it out, right?

If you're a woman, you want to fast for all the health reasons that we hear about with regards to telomere length, improving longevity, improving our body's metabolic control. Then we work with our circadian rhythm where we stop eating at dinner. So we have dinner and we don't eat two to three hours before bed. We have the overnight fast.

If you're a woman, you want to fast for all the health reasons that we hear about with regards to telomere length, improving longevity, improving our body's metabolic control. Then we work with our circadian rhythm where we stop eating at dinner. So we have dinner and we don't eat two to three hours before bed. We have the overnight fast.

And then you want to have food within a half an hour of waking up to blunt that cortisol peak that's natural upon waking. For men, you can have variations of fasting. You can do intermittent fasting, you can do warrior fasting, and you can still have benefit. But for women, when we look at the data, and if we were to do a warrior fast, which is a 20-hour fast, four-hour eating window,