Confused by different types of carbs? Learn the REAL difference between simple and complex, high glycemic and low glycemic foods, and good vs bad. Jeff Volek, Ph.D., and registered dietitian and professor in the Human Science Department at Ohio State University, has done enormous work in the. ![]() Going Low- Carb too Fast May Trigger Thyroid Troubles and Hormone Imbalance – drcate. Written by: Dr. Cate on February 2. Don’t be fooled by the bread demons, you CAN be healthy on a low- carb diet. If you’ve been turned on to the low- carb Paleo diet craze, you may have noticed increased energy, better digestion and happier mood, and a shrinking waist line. Good for you. But some folks who’ve taken the Primal leap—particularly those who were previously on a high- carb diet—have been faced with unexpected side effects waving them back to the world of bread, sugary fruits and sweet potato casserole. Interestingly, these side effects include a wide range of symptoms that are nearly identical to symptoms of severe thyroid hormone deficiency. More interestingly, lab tests often show normal or near normal thyroid function. More interesting still is that these symptoms seem to only be relieved by adding back carbs into the diet, sometimes upward of 3. I consider to be very likely to harm. Why is this happening? Is it that low- carb simply doesn’t work for everyone, or is something else going on? In an effort to get to the bottom of this, low- carb blogger Jimmy Moore is asking his cadre of low- carb literate practitioners to weigh in on the issue with our opinions. ![]() Dieting is the practice of eating food in a regulated and supervised fashion to decrease, maintain, or increase body weight. In other words, it is conscious control. Low-carb snack foods are great for people who are trying to become more physically fit, as well as those who already have strict fitness regimens, such as runners. Fad diets come and go, but in my practice, I follow the science more carefully than I follow the fads. In doing so, I have been tremendously impressed with the work. LISTEN (20 Minutes) Earlier this summer, Steve Phinney and Jeff Volek, authors of The Art and Science of Low Carbohydrate Performance, headed to the Western States. This so happens to be an issue I’ve been pondering since reading about the controversy over safe starches, and a couple pieces of the puzzle recently fell into place that I think I add up to at least one explanation for the debilitating symptoms some people develop on going low- carb, and offer a method for anyone going low- carb to do so without problems. Here’s what I discovered about those with thyroid problems. Abrupt Change May Be too Much For the Thyroid. People who run into trouble going low- carb seem to follow a pattern. They follow any number of diets from SAD to vegan before making a relatively abrupt switch to a low carb (often less than 5. At first they lose weight as hoped but then, instead of feeling more energetic from their weight loss, they develop fatigue, sometimes accompanied by symptoms of low thyroid function including cold extremities, hair loss, and digestive problems. Only by consuming more carbs again can they reduce these symptoms. Because their fatigue and other symptoms are classic for thyroid malfunction, many will get their levels tested, only to come away confused when the tests health practitioners typically order (TSH and T4) come out normal. Those who get more extensive testing may get a test called reverse T3, or r. T3 for short. These are often abnormally high, leaving them to believe they have found the root of the problem. Some are given a prescription for T3 in hopes of regaining energy and the intervention seems to help, at least a little. Reverse T3 is a kind of chemical opposite of regular T3, a mirror image compound called an enantiomer. Reverse T3 has opposite effects of T3, and has long been associated with a set of symptoms aptly called hibernation syndrome—fatigue, weight gain, and so on. If you have suffered from severe hypothyroidism, you may have gone through times where you felt like you really just want to crawl away to a quiet place and rest for a long, long while. Your body was telling you to hibernate. In addition to making our energy go dormant, high r. T3 is also associated with increased levels of LDL, often in the 2. Interestingly, those who have added carbs back into their diet and have gotten retested find that their levels of r. T3 have gone down without additional T3 supplementation. What’s more, if their LDL was high, adding carbs back to the diet also solved that problem as well, completely counter to the idea that carbs drive insulin which increases LDL. I have to admit that though I have cared for thousands of people following low carb diets to my knowledge none ran into this problem so I paid very little attention to the issue with r. T3. Only when I started reading about people suffering from thyroid side effects from following low carb did I started seriously thinking about that pesky little molecule. I wondered what it was supposed to be good for: Why would nature program our biology to manufacture a compound that seems to do little other than make people miserable and potentially clog our arteries? The reason low carbing triggers thyroid changes. In doing research on r. T3, I ran into a fascinating article on a group of little- understood compounds called thyronamines (pronounced thigh- row- na- meens). The key to understanding r. T3, and unlocking the relationship between carbohydrate consumption and thyroid function, may lie in these newly discovered compounds. Thyronamines have powerful effects on energy metabolism. Studies performed in 2. Impaired ability to utilize sugar as an energy source. Insulin resistance. Lowered basal body temperature. Weaker than normal heart contractions. A marked decline in activity (We can’t ask the lab animals, but presumably this would be induced by what we would describe as feelings of extreme fatigue)Sound familiar? Upon injection, the effects begin within minutes and last 8- 1. And here’s the punchline: Thyronamines appear to be manufactured from that go- to- sleep hormone reverse T3. We can’t yet test you for high levels of thyronamines, but in testing your r. T3, we are testing for the precursor of thyronamines. And I expect that, when studies are done in people, we will discover that high blood levels of r. T3 does indeed correlate with high tissue levels of thyronamines. I think this research is vitally important and that we will be hearing more about thyronamines in the future. But we are still left with a very important question that remains unanswered: What do we do about it? For an answer, we can look to nature and find what I call The bear in the woods theory. Changing from carb- burn to fat- burn demands new metabolic machinery. The bear in the woods theory suggests that it is the relatively sudden change from high carb to low that flips the switch. Bears are omnivores, just like humans. And, of course, bears hibernate. Understanding the variations of a bear’s diet throughout the year helps us to understand why biology has built into our mammalian metabolism a sensitivity to changes in carbohydrate consumption. Imagine you are a bear living in Yellowstone national park. It’s late summer and the salmon runs are gone, the grazing animals born in spring have now grown too fast for you to catch, the grubs under the rocks are all hatched, and pretty much all that’s left, aside from campground garbage, is nuts and berries. Plucking ripe berries off a bounteous shrub is far easier than cracking nuts, so you gorge on berries. In a few weeks, though, the berries are gone and there’s very little food left. That’s okay, because the abrupt decline in carbohydrate consumption is accompanied by increased reverse T3 and increased production of thyronamines, which makes you feel exhausted. Thanks to all the weight you gained, you are now so well padded with cushy fat that you think you could just crawl into a cave somewhere and sleep for a long, long time. Research in humans shows that, just like bears, our thyroid hormones are influenced by major changes in the amount of carbohydrate consumed. For some, an abrupt decline in available glucose may trigger an atavistic hibernation reflex, which will trigger the conversion of a thyroid hormone called T4 into something other than the normal T3, namely into the reverse form, r. T3. How do you enter fat- burning mode without going into hibernation? The solution is gradual change. If you have gone low carb successfully, you have accomplished a major change in your metabolism, one that involves turning on scores of enzymes your body has not needed or used for a long time, decades in some cases. Not everyone can accomplish this overhaul in time. Those who can often continue low carb for life with great success. But those who cannot accomplish all the necessary changes flip the hibernation switch, increase production of r. T3 and thyronamines, which causes crushing fatigue and may lead to intense carb cravings in order to turn off the hibernation switch again. For these people, an easy way to avoid flipping the hibernation switch and reduce carb cravings may be to simply make a more gradual reduction in carbs rather than an abrupt one. Atkins, who advocates an abrupt switch to less than 2. Unfortunately, for some people, the fatigue never improves and they give up on low- carbing all together. Instead of giving up, I believe you can try again but next time don’t go cold turkey on carbs. Cut back gradually. Incidentally, none of my patients reported feeling worse when they went low carb. I suspected it had something to do with the fact that I introduced them to low carbing one meal at a time beginning with breakfast. I made this recommendation simply because I didn’t have time to go over everything with them in one visit. I only had time to give them ideas for one meal, and had them start by cutting carbs from breakfast because that is the time of day we are most able to switch our dormant fat- burn enzymes from off to on. Bottom line: If you jump into the Paleo (or any low- carb) program and hit a brick wall because of side effects, instead of giving up on low- carbing for good, add back your carbs until you feel better again and then try cutting down again, but go slow to give your body the time to adapt to the idea. This way, your low metabolism can gear up to give you the fat burning benefits of hibernation without having to take the four month winter snooze. Come out of the Carb- Cave and into the light of a rejuvenating diet! Are Low- Carb Diets Unhealthy for Kids? Feb. 1. 3, 2. 00. Even if you're among the 1. Americans currently on a low- carbohydrate diet, your children shouldn't be - - even if they are overweight. Experts tell Web. MD that diets such as Atkins and South Beach can be unhealthy for growing kids, including those with growing waistlines. With diets that restrict these and other important nutrients, it shortchanges kids in a way that can affect their growth and development. When a body is robbed of carbohydrates, the body draws its energy from ketones, a byproduct that results from breaking down body fat. This process explains some of the dramatic weight loss that can be achieved with eating plans that restrict carbohydrate intake. Obviously, it's a good idea to limit their intake of . Beyond that, there's no need to prepare separate meals for the young'uns - - even if you're following a low- carb eating plan. Put Nutrition First. If you're having a hamburger without the bun, make sure they have theirs with lettuce and tomato. By all means, fruits, vegetables, and whole grains are important for children - - even if you're restricting them in your own diet. But Stephen Sondike, MD, a spokesman for Atkins Nutritionals and director of a pediatric obesity program at Children's Hospital of Wisconsin, maintains that the low- carb approach is safe and effective for children who need to lose weight. He points to research he conducted, published last March in the Journal of Pediatrics, comparing the Atkins approach against a low- fat diet in teenagers for 1. We feel by lowering the amounts of those foods in meal plans, that's going to make everyone healthier. High- glycemic foods raise blood glucose level quickly, which can lead to obesity and type 2 diabetes. Meanwhile, potato and citrus growers have recently launched marketing campaigns to tout the nutritional benefits of their foods, in part because sales have dwindled because of the low- carbohydrate craze. Pasta manufacturers are expected to follow suit. Some of these foods are frequently consumed by endurance athletes such as marathon runners to improve their performance. It doesn't matter if it is fat, protein, or carbohydrates, it's just not healthy. Bruce Rengers, Ph. D, assistant professor of nutrition and dietetics, Saint Louis University Doisy School of Allied Health Professionals, St. Stephen Sondike, MD, spokesman, Atkins Nutritionals; director, Nutrition, Exercise, Weight Management program, Children's Hospital of Wisconsin, Milwaukee. Jim Bell, president, International Fitness Professionals Association, Tampa, Fla.; member, Florida Gov. Jeb Bush's Task Force on Obesity. Sondike, S, Journal of Pediatrics, March 2. All rights Reserved.
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