Why Most Diets Fail And What Actually Improves Metabolic Health

Diet trends promise quick results, but your biology has a different plan. We unpack why hunger surges, metabolism adapts, and ultra-processed foods make willpower a weak strategy, then chart a clearer path built on insulin-aware eating, steady satiety, and sustainable routines. Along the way, we put intermittent fasting, keto, low-fat, vegan and vegetarian, and gluten-free claims under the microscope, separating marketing from mechanisms and sharing what actually helps day to day.

I walk through common sticking points I see in clinic: fasting that ends in late-night binges, low-fat swaps that spike added sugar, plant-based choices that miss protein and fiber, and gluten elimination used as a one-size fix. Then we pivot to practical, evidence-backed frameworks. DASH and Mediterranean patterns consistently improve heart and metabolic health with more vegetables, legumes, fish, nuts, and olive oil, and fewer refined carbs and sugary drinks. Even if the scale moves slowly, the markers that matter most trend in the right direction.

You’ll leave with simple levers to pull this week: eat within a reasonable 12-hour window, cut routine snacking, anchor each meal with lean protein, load up on fiber-rich plants, and choose healthy fats that keep you full. Add sleep, strength training, and a quick check on medications that influence weight, and you have a plan your biology can live with. If this conversation helps you rethink your approach, subscribe, share it with someone who needs clarity, and leave a review so others can find their way to better metabolic health.

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Transcript

Welcome & Scope Of Metabolic Health

Dr. Lindsay Ogle, MD 0:00

Welcome to the Modern Metabolic Health Podcast with your host, Dr. Lindsay Ogle, Board Certified Family Medicine and Obesity Medicine Physician. Here we learn how we can treat and prevent modern metabolic conditions such as diabetes, PCOS, batty liver disease, metabolic syndrome, sleep apnea, and more. We focus on optimizing lifestyle while utilizing safe and effective medical treatments. Please remember that while I am a physician, I am not your physician. Everything discussed here is provided as general medical knowledge and not direct medical advice. Please talk to your doctor about what is best for you. There are so many diets out there. It can be overwhelming and confusing. And most of my patients who come to me for the treatment of obesity have tried nearly all of them. And today I want to go over some of the most popular diets and talk about the pros and cons of them and really highlight which ones I recommend and which ones I don't. I help my patients achieve and maintain a healthy weight for them to help improve and prevent weight-related conditions. And I help them optimize their lifestyle and I utilize safe and effective medications when appropriate. But even when I use medications for patients, we are always fine-tuning our nutrition and our lifestyle. And I will say just right up front, there is not one diet that I recommend. And it is because everybody has their own preferences and their own tolerance and their own lifestyle and you know health conditions that will impact how they respond to different diets and what they need out of a diet. And so I am not a one-size-fits-all person. I am not handing people a nutrition plan. We are working together to find what works for them. But first, let's talk about why most diets fail in general. And it is not because of lack of willpower, it is not because any fault of the person following that diet. It is because of a combination of biology and our environment. Biologically, when we are in a calorie deficit, which is required to lose weight, your body responds to that by increasing hunger hormones like ghrelin and decreasing your metabolism because it thinks that it's helping you. Evolutionarily, when we were not getting enough calories, that meant that we were in danger, that we were starving, and the body was created to hold on to our extra energy stores, our extra calories to save them for a time when that might be the case, when food was not available. But in our modern world, food is readily available for most of us, and we don't need that mechanism anymore, but that is what we are working with right now with our biology. And so when we diet and we reduce our caloric intake, or we're exercising more and we're losing weight, the hunger hormones go up and metabolism goes down, and that sets people up to eventually regain their weight because it's truly impossible to maintain long term, especially in our modern environment when we are fighting against marketing of all of these um, you know, foods, both healthy and unhealthy. And we have truly food scientists who are creating foods that are more palatable, and you know, most of them have more calories than typical, they're calorically dense, and so we are getting more calories per food that we're taking in compared to previously. There are other things at play where other than just calories in versus calories out that lead to weight gain or weight loss. There is also our genetics and our epigenetics. This is not something that we can control. We are born with this, and this is based on our ancestors, and then also things that we were exposed to when we were in utero, when we were just in our mom's bodies and growing that way. There's also influence on hormones, so most notably insulin, but also cortisol and estrogen. There's also influence on endocrine disruptors, so those are things in the environment like microplastics and um pollutants in the air. Also, um body composition. So the more muscle mass we have, the higher our metabolism is at rest. So that plays a role are our sex assigned at birth. So men tend to have more muscle mass and have a higher resting metabolism than women tend to. Medications that we're taking can either promote or um promote weight gain or lead to weight loss. And surgeries that we've had in the past, anatomic differences, um, as well as other medical conditions can change whether we are prone to weight gain or weight loss. So there is so much more than calories at play, but calories are an important part. So diets do work, but only short term. As I mentioned in the very beginning, most patients who come and see me at Missouri Metabolic Health and they're looking for help with weight management, they have tried almost every diet available. So let's review some diets that claim to help with weight loss, but really ultimately don't. First, we'll start with intermittent fasting. This one was extremely popular over the last couple of years. I don't hear it talked about as much anymore. But intermittent fasting really claims to help with weight loss by reducing insulin. And reducing insulin is helpful for weight management because insulin tells our body to hold on to energy. So when we have high levels of insulin, it is very difficult, if not impossible, to lose weight. So if you are intermittent fasting, then that gives your body a chance to lower insulin levels during that fast period and release energy and release stored fat. The problem with intermittent fasting is, is if you, especially if you do prolonged fasting, that you are truly hungry when your time fast is over. And so many people then overeat when it is time for them to eat in their eating window, it's often called. And when you're really hungry, and especially if it's later in the day and you're tired and overworked, you're going to reach for foods that are very easy, satisfying, and give your brain a lot of dopamine. So if this is you, if you notice that pattern when you've done intermittent fasting, I do not recommend this diet because you are not going to be feeding your body healthy nutrients and you're going to start a binge eating cycle. That also is a good reminder that intermittent fasting is not a good idea for anybody who has a history of an eating disorder, especially binge eating disorder, because this is going to perpetuate the cycle. Intermittent fasting can mean a lot of things to different people. It could be a multi-day fast or it could be even eating in a 12-hour window. But typically I hear people referring to a 14 or a 16, sometimes 18-hour fast, and then eating in, you know, the remaining window of the day. I think it's very reasonable to do a 12-hour fast. That counts. I mean, many people don't consider that intermittent fasting, but I think it can be really helpful for most people and reasonable for most lifestyles. But ultimately, I think what's can be extremely beneficial, and this is something that I noticed personally in my life, is even just cutting out snacking can be really powerful to give your body that time in between meals for insulin levels to lower. So to me, a compromise for intermittent fasting could be cutting out snacks and eating within a 12-hour window. Some people may benefit from longer fast, and that is okay if it works for you, but this intermittent fasting does not guarantee that you're going to lose weight. Kind of on the flip side of intermittent fasting is intuitive eating. And intuitive eating is when you listen to your body's hunger cues and eat when hungry and stop eating when full. And for many people, not everybody, because I do have patients who do a ketogenic diet and do wonderful on it, but many people, this is not sustainable long term. And therefore, I don't tend to recommend it, but it could be an option. The opposite of that is a low-fat diet, which was popular in the 90s, and there were so many low-fat options of snacks and you know, low-fat yogurt and low-fat ice creams and lots of different desserts that were available that were in low-fat version. The problem with the low-fat diet, I will say it was created because the thought process was that it that was going to help prevent cardiovascular disease. Unfortunately, that is not the case, and cardiovascular disease has continued to rise in occurrence and incidents, and is the number one cause of death for both men and women. The reason I think this is happening is because if you are lowering fat, typically you are increasing your carbohydrate intake, specifically added sugars. And we know that added sugar has a negative impact on metabolic health, weight management. It can increase your insulin levels and that can cause inflammation in your body, and that can increase your risk of cardiovascular disease and many other chronic conditions. So low-fat diets I don't recommend. It typically also leads to a lot of hunger because fat in our diet helps to satiate us, it helps to, you know, have us feel full and to maintain that fullness in between meals. So I don't see low-fat diets being a great option. I see that as the 90s diet culture and it should stay in the 90s. Next is vegetarian or vegan diets. Now, this can be a wonderful option if you want to be vegan or vegetarian for um animal justice reasons or environmental reasons. Um, and if done right, it can be very healthy. Um, it can be a very healthy diet, but it needs to be done right. You can be vegan and only, you know, eat Oreos and rice and you know high carbohydrate, high calorie food with not a lot of nutrients in it. When done right, it will look like um lots of fruits and vegetables, nuts, seeds, legumes, whole grains. And I have a colleague, Dr. Shayla Toomes Withers, who is an obesity medicine physician and a lifestyle physician. And she has a podcast that um helps people to live a plant-forward lifestyle. And I will link that below if you are somebody who is interested in a vegetarian or vegan diet, because she will help guide you to do this in a healthful way. But just because you follow a vegetarian or vegan diet does not by any means mean that you are going to have weight loss, and some people may even gain weight on these diets. Gluten-free diets um are fairly popular, especially in um, should I say the alternative medicine world? Um, gluten gets blamed for a lot of things. The truth is the only people who really need to avoid gluten are people who have celiac disease. And that can be tested for with blood tests, stool tests, colonoscopy. If you have low iron levels without a clear reason why, you are constantly tired, or if you have stomach upset after you eat foods that contain gluten, which are grains that have wheat, barley, and rye, then ask your doctor to be tested for this, and you should avoid gluten because that can cause negative health consequences. There are, that being said, there are a subset of people who are sensitive to gluten. It's not going to cause health, negative health outcomes, but may cause a little bit of bloating, maybe a little bit of fatigue. Um, and you can test this out by eliminating gluten. There is no test for gluten sensitivity at this time, at least that I'm aware of, that has been proven to be accurate and effective. Um, but you can try eliminating gluten if you're somebody who deals with a lot of bloating. Um, my worry with that is it could be hard to get enough of your daily dose of fiber. So you definitely need to make sure you're getting fiber through other sources: fruits, vegetables, um, nuts, and seeds. But um a gluten-free diet does not mean that you are going to lose weight. It just means your diet does not have gluten in it. That's all. And then the two diets that have the most evidence for health benefits are the DASH diet and the Mediterranean diet. The DASH diet is stands for dietary approach to stopping hypertension. And the Mediterranean diet is a way of, it's truly a way of life, but a way of eating that typically occurs in the Mediterranean area of the world. Both of these diets really emphasize more fruits, vegetables, nuts, seeds, um, fish, and poultry and olive and olive oils, and then they limit added sugars and high amounts of saturated fats. I highly recommend looking into DASH and or Mediterranean diets because although they probably won't lead to weight loss, they will help improve your overall health. You may feel better and you will decrease your chance of cardiovascular disease when you follow this style of eating. So I do recommend these diets, not for weight loss, but for health. And then overall, the worst diets to follow are fad diets. The ones that are extremely restrictive, like a cabbage soup diet. I don't really even know any of the names of them anymore. Um, but anything that's extremely restrictive, oh, grapefruit diet is one of them. Um, I do not recommend these. They are diet culture at its best. They will lead to excessive hunger, likely binge eating when the diet is done. It'll negatively impact your metabolism long term. They are not setting you up for success and have a high chance of doing harm. So avoid fat diets. At all possible. And going back to the beginning, I don't necessarily recommend a diet. I mentioned the Dash and Mediterranean diet as kind of an outline. Um, but the main things with those diets are that they decrease added sugars, especially sugar-sweetened beverages, and they emphasize lean protein sources and dietary fiber. If you focus on those things, it's not exciting, it's not sexy, but it is proven to improve your health. So I recommend following those general principles. You can track your nutrition intake for a couple of days and see where you're at as far as calories, added sugar, protein, and fiber. And if you are not reaching your goals, or if you are overconsuming one of those categories, then you can talk with your obesity medicine physician, your primary care doctor, your dietitian, and get some guidance on how to slowly improve those over time. And that will set you up for long-term success from a weight management standpoint and a health standpoint. I hope you found this helpful. I hope this prevents you from doing any overly restrictive diet or falling for a marketing scam online to join a program that overpromises and underdelivers the you know simple proven recommendations are still true today. Thank you for listening and learning how you can improve your metabolic health in this modern world. If you found this information helpful, please share with a friend, family member, or colleague. We need to do all we can to combat the dangerous misinformation that is out there. Please subscribe and write a review. This will help others find the podcast so they may also improve their metabolic health. I look forward to our conversation next week.