What Is Obesity
Obesity is a chronic condition characterized by an excessive accumulation of body fat that negatively impacts health. It is defined as having a body mass index (BMI) of 30 or higher. Obesity is a serious health condition that can have significant negative consequences. It is important to understand the risks and take steps to prevent or manage obesity through healthy lifestyle choices.
Are Hormones To Blame For Obesity?
Hormones are often blamed for fat gain and the inability to lose fat. They definitely play a role, but they’re often not independent of overeating. Many of the hormonal problems which make it harder to lose fat are caused by what made you fat in the first place – Chronic Overeating and Not Exercising.
Hormones that impact our capacity to lose fat are normally insulin, leptin, cortisol, and thyroid hormones. So let’s look at each of those individually.
Insulin And Obesity
Insulin is probably the most maligned hormone in the human body, but insulin actually doesn’t make you fat. It is a “storage” hormone so it’s easy to assume that more insulin equals more fat gain. But insulin can only lead to the storage of the energy that you consumed. You cannot store more calories than what you’ve eaten. So, it’s still a matter of eating more than what your body needed.
With weight gain, we usually talk about insulin resistance being the problem. Insulin resistance means that your cells don’t respond well to insulin and as a result you need to produce more of it to get the job done.
If you’re insulin resistant and you eat a meal, you release more insulin than someone who’s insulin sensitive (especially if the meal was higher in carbs). As a result, insulin stays elevated for longer. When insulin is elevated above baseline, the body is less efficient at mobilizing stored energy. It can still do it, but to a lesser extent. This means that it’s a bit harder to lose body fat.
Insulin Resistance Doesn’t Lead To More Energy Storage / AKA Fat Storage
When you’re insulin resistant, your body needs more insulin to achieve the same effects. The key difference lies in how long insulin levels remain elevated, which suppresses fat mobilization for extended periods. Two main factors contribute to insulin resistance:
- Chronically high insulin levels
- Consistently full energy stores
When your body constantly produces large amounts of insulin, your cells gradually become less responsive to it—meaning it takes more and more insulin to do the same job.
What Leads To Excessive Insulin Production
- Eating too much, too often, and overeating foods that increase blood sugar levels.
- The second factor is having the energy reserves (muscles, liver, fat cells) topped off.
When you eat, your blood sugar and fat levels go up. Your body releases insulin to move those nutrients out of your blood and into your cells for energy or storage. But if your energy stores are already full, there’s nowhere for them to go. So your body makes even more insulin to try to push them in, and over time, this can lead to your body creating new fat cells to store the extra energy.
What Can Cause Energy Reserves To Be Full?
Eating too much. More specifically, eating too many calories. Overeating can easily lead to insulin resistance. That’s why there’s a higher occurrence of Type 2 diabetes among obese individuals.
Leptin And Obesity
Leptin is a hormone released by fat cells. When it reaches the brain, it connects to leptin receptors and essentially tells the brain that we’re well fed and done eating. Metabolism stays normal, your appetite is kept under control, etc.
What Happens If You Go On A Diet?
If you go on a diet, the more you lose fat the less leptin the fat cells will release. It’s a way to tell your brain that you aren’t getting enough energy in, and you need to do something about it.
If leptin is low enough for long enough, the body will increase hunger to force you to consume more nutrients. The less leptin you produce, the hungrier you get. If it stays low for long enough, it can even contribute to a slowing of your metabolism. The fuller the fat cells are, the more leptin you produce.
Theoretically – Obese individuals should produce tons of leptin, which should also kill their appetites and lead to a lightning-fast metabolism, right? But that’s not exactly what happens.
Then What Happens?
Unfortunately, obese people produce so much leptin that they desensitize their leptin receptors. Their brain stops responding to leptin. Even though they produce a lot of it the result is the same as if they weren’t producing much. They get hungry, they eat to satisfy that hunger, and their metabolism doesn’t become powerful enough to counteract it.
In this case, hormones really do make it harder to lose fat. But the leptin problem comes from weight gain itself, which is self inflicted. Eating too much for too long causes the body to make lots of leptin because the fat cells are full. Once those cells are packed, the body creates new fat cells — and that means even more leptin. Over time, this constant overload leads to leptin resistance, which makes fat loss harder. It’s not about genetics. It’s the result of long-term poor eating habits.
Thyroid Hormones And Obesity
It’s easy to link low thyroid levels with obesity. Thyroid hormones, especially T3, control your metabolism which is the rate at which your body burns energy. So the idea is that if you have low thyroid function, your metabolism slows down, making it easier to gain fat.
That sounds simple and like it’s out of your control, but it’s not quite that straightforward. On its own, hypothyroidism only causes a small amount of weight gain — not the kind that explains being 100 pounds overweight. While it can increase your risk of obesity, it’s rarely the main cause.
In fact, it often works the other way around. Gaining excess fat can cause thyroid problems. When you’re obese, your body produces too much leptin and releases inflammatory chemicals from fat cells. These can interfere with iodine uptake – which your body needs to make thyroid hormones – and slow thyroid function. So, just like with leptin and insulin resistance, thyroid issues in obesity usually come from the same habits and conditions that led to weight gain in the first place.
Cortisol
Cortisol actually helps with fat loss. Its main job is to release stored energy like glucose, fatty acids, and amino acids. But when cortisol stays high for too long, it can slow fat loss by reducing the conversion of the thyroid hormone T4 into T3, which lowers metabolism a bit. Still, that small drop – about 5% – isn’t enough to cause obesity. In most cases, these hormone issues come from chronic overeating or from being overweight itself. The good news is that means you have control—you can take action and turn it around.
Wrapping It All Up
Obesity isn’t just about hormones – it’s mostly about long-term habits. While hormones like insulin, leptin, thyroid hormones, and cortisol all affect how your body stores and burns fat, they usually become unbalanced because of overeating and lack of activity, not the other way around.
Insulin resistance, leptin resistance, and slower thyroid function often develop after years of eating too much and moving too little. These hormonal changes can then make it harder to lose fat, creating a frustrating cycle – but it’s one that can be broken.
The good news is that obesity is largely within your control. By improving your eating habits, staying active, and managing stress, you can maintain and restore hormonal balance, boost your metabolism, and take back control of your health.
If you need help with losing weight please contact us. We look forward to hearing from you and helping you achieve your wight loss goals.
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