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How Does Keto Affect Your Thyroid?

– Before you think that the
ketogenic diet’s going to completely disrupt your thyroid function, watch this video. Hey, I’m Thomas DeLauer with Keto Mojo, and I’m going to be
giving you the breakdown of what’s going to happen with
your T3 levels, your T4 levels, and your overall thyroid function when you’re following the ketogenic diet. Okay, so first and foremost,
a lot of the bad press simply comes from the fact that sometimes when you’re
on a ketogenic diet, you can see a small decline in T3 levels. Now T3 is the active
circulating thyroid hormone, but it is not a direct indicator
of thyroid function itself. See let me explain some stuff. There’s a study that was published in the journal Diabetes and Metabolism, and it found that when people
went on the ketogenic diet, that they had a big increase in fat substrates in their blood. They saw in increase in glycerol, they saw in increase in free fatty acids, they saw an increase in
beta-hydroxybutyrate, and they saw a decrease in glucose and a decrease in insulin. But they also saw a decrease in T3, but their T4 levels remained unchanged. So let me explain what this means, ’cause this is the particular study that’s caused a lot of
confusion for people. All that this means is that
at that very point in time, the T3 levels were lower. If the T4 levels were low, then there may have been
some cause for concern. You see, T4 is the precursor to T3. T4 converts into T3, and if
T4 levels were super elevated or super decline, then
we would be concerned. But since T4 levels didn’t change, it’s not that big of a deal
because what that means is that the thyroid is still functioning, there’s just not a need for
it to ramp up T3 production. So it’s really not concerning. See, lower T3 doesn’t
always mean things are bad, and I’ll explain a little bit
more about that in a second. But there’s another study,
and this study was published in the journal Metabolism,
Clinical and Experimental. And it took a look at test subjects, in this case six weeks
with 12 healthy men, 12 healthy men that had been accustomed to a traditional carbohydrate rich diet, about 48% carbohydrates, and
then they had them go keto. When they had them go keto, they noticed some
interesting results happened. They had a big decrease in fat mass. They lost about 3.4
kilograms of fat on average and they gained approximately
1.1 kilogram of muscle. This is really, really powerful. They had a small increase in T4, they had a reduction
in insulin and glucose, and their T3 levels
ultimately remained unchanged. So they had a small increase in T4, they had a small increase
in thyroid production, which is pretty interesting, but just not an increase
in overall thyroid hormone at that point in time. The reason that this is so
unbelievably fascinating is because they lost weight,
but they also built muscle, which if you are hypothyroid, and your thyroid wasn’t working, this would be very, very difficult to do. It’s very difficult to
burn fat and build muscle if your thyroid isn’t functioning. So even though T3 levels
remained unchanged, and a small elevation in T4, everything still worked fine. So here we have two studies,
the Diabetes and Metabolism, and then the other
study I just referenced, that kind of have conflicting information. The point is a lot of it depends on the point in time
in which T3 is tested. So let’s go ahead and
talk about why T3 levels might get suppressed on keto. It all has to do with calorie restriction. See, it doesn’t matter whether
you’re doing keto or not, if you’re suppressing calories, you’re going to suppress your T3 levels. You see, your thyroid is sort of like the barometer for your body. It’s going to always kind of
balance with what’s going on. So if your metabolism is slowing down because you’re reducing calories, then of course your
T3’s going to slow down. It doesn’t need to stay ramped up. You’re a lesser-weighing person, you’re eating less, less
metabolism overall, less thyroid. It’s plan and simple. So a lot of times when
people go on a keto diet, they’re restricting their calories too ’cause they’re trying to lose weight. So of course your T3 levels
are going to be compromised, but you have an added benefit. You retain a lot of muscle when
you’re on a ketogenic diet, so actually your T3 levels are
going to be less suppressed on a keto diet than they
would be on a traditional calorie restricted diet. Just to put this into
context, there was a study that was published in the journal Thyroid that took a look at 47 test subjects, and they measured them over
the course of 12 months while they were losing weight. On average, they lost between five and 10% of their overall body weight. At the end of that 12 months, they found that there was a
change in their T3 levels. It went from 112 nanograms per deciliter down to 101 nanograms per deciliter. It’s a pretty dramatic decrease, and this was on a wide spectrum of just weight loss
protocols, not just one. They just had them reduce
calories and lose weight, and they all ended up having a pretty even drop in T3 levels. So it’s nothing to be concerned with, but if your T3 levels are low, there actually are some positive effects. You see, the JAMA published
a study that found that when your T3 levels are lower, you actually live longer. You see, your metabolism in essence isn’t having as much waste. So it’s easier to live longer. Calorie restriction has
shown to improve longevity in a lot of different animal
models and human models. But what’s really cool is that
when we look at the T3 link, there is some direct correlation. So the study published in JAMA found that generally speaking,
when thyroid was lower, subjects lived three
and a half years longer. But I have to add one more thing. There’s a lot of misconception out there surrounding the world
of carbs and thyroid. People say that when you consume carbs, it elevates your thyroid hormone, it improves your thyroid function. Not really the case. What happens is glucose metabolism in and of itself requires T3. So yes, when you consume carbs,
your T3’s going to go up. But guess what, it’s not
going up for your entire body. It’s only going up to facilitate the metabolism and the
process of said glucose. So let’s say for example, you
consume 100 grams of carbs. Your body’s going to
elevate just enough T3 to process those carbs and
nothing above and beyond. So sure, you might have
an elevation in T3, but it’s only there to process the carbs, not to actually boost your metabolism. I rest my case, right then and there. Anyhow, don’t be afraid
of keto and your thyroid. If anything, it’s actually
going to allow a nice level of homeostasis to begin occurring as far as your endocrine
system’s concerned. So make sure you’re keeping it
locked in here with Keto Mojo and leave the guesswork
out of the equation. When it comes to testing your ketones, rely on the Keto Mojo meter, so you can get an accurate and thorough reading every single time. I’ll see you in the next video.

Randall Smitham