Do you know the most common cause of weight loss resistance
by Dr. Shawna Darou, ND in Nutrition
I get a lot of referrals for what is known as 'weight loss resistance'. What this means is that someone has been following a nutrition and exercise program well, and are not seeing any results in their weight loss, or results are very small and disproportionate to the efforts you are putting in. It's an extremely frustrating place to be, because usually when you decide to make a change and start to put in the effort, you expect to see a result.
There are a few common causes, and then some less common ones, and sometimes there are several things happening at the same time. The great news is that we can almost always find a concrete answer, and then get on with treating it. What I have learned through years of practice, is that it's important to be thorough - meaning that if you identify one issue, don't stop looking, because there may one or more issues also contributing. This also why you may be frustrated - you think you have found the reason, but there's still no change.
The Most Common Cause of Weight Loss Resistance: Insulin Resistance
The most common cause of resistant weight loss is insulin resistance.
This condition is notorious for slow and difficult weight loss because the body is in a state of storing rather than burning. Insulin resistance develops over time with:
Overeating carbohydrates and sugar
Not enough exercise
A sedentary lifestyle
Poor sleep quality
Genetic predisposition
The good news is that insulin resistance is 100% reversible—it just takes time.
Learn more about balancing blood sugar and preventing insulin resistance.
What Is Insulin Resistance?
Insulin is the hormone that is released from the pancreas in response to glucose (sugar) in the blood. Insulin levels spike after eating a meal. When insulin is released in a non-insulin resistant (healthy) person, it triggers the body’s cells to utilize glucose and fats from the bloodstream. Insulin resistance occurs, when cells do not respond or respond weakly to the insulin signal. This results in the body secreting even more insulin and eventually creating toxic levels of glucose in the blood, known as high blood sugar.
Common symptoms of insulin resistance are:
weight gain (often rapid in a period of two to three years) - the period of time you went up 20+ pounds in a year is likely when insulin resistance started
intense cravings for carbohydrates or sweets
increased appetite
feeling tired or bloated after eating
carrying extra weight in the central abdomen
very slow and difficult weight loss
in women it is also associated with acne and hair thinning
What are other contributors to weight loss resistance?
Although insulin resistance is the most common cause of weight loss resistance, there are other possible causes. Here are some of the more common ones:
Consistency - Are you being consistent with your habits and nutrition? Including weekends, vacations and celebrations? Sometimes we need to get strict with a plan to get results, and then moderation comes later on.
Stress - Ongoing high stress can interfere with weight loss, and especially holding onto abdominal weight. This also impacts food cravings, sleep and motivation to exercise.
Not enough sleep - Did you know that when you sleep less than 6 hours per night, your body is in an insulin resistant state regardless of what you're eating? When you don't sleep, you're also more likely to crave carbohydrates and sugars to keep yourself awake.
Too much fasting - This one may be controversial, but I often see too much fasting as a cause of a slower metabolism, especially in women. Women's bodies are much more sensitive to metabolic stress, especially if you're also very active or have a high stress-load.
Too many diets and a slower metabolism - If you have been dieting on and off for years, and tend towards major calorie restriction or avoiding carbohydrates, you may have literally slowed your metabolism. In this case we need to assess your true metabolic rate, and gradually increase your energy intake to reverse the effect of chronic dieting.
Sedentary life (even if you're exercising) - One thing many people are not aware of is that even when you exercise in the morning, if you spend the rest of your day sitting down, you're still considered sedentary, and this can impact your metabolism and metabolic health in general.
Inflammatory foods - One of my favourite short-cuts to moving through resistant weight loss is to identify inflammatory foods. This is typically things like gluten, cow's milk dairy, sugar or eggs, and surprisingly they can contribute to food cravings, change in digestion and also weight.
Thyroid imbalance - Thyroid is probably the most obvious on the list, and most people start here with bloodwork. They may not however be thoroughly testing thyroid function with a full panel including TSH, free T4, free T3, TPO-antibodies and anti-thyroglobulin. A full panel can more fully assess whether thyroid is the missing piece.
Gut microbiome - You may or may not be aware that the gut microbiome has a role in your metabolism. It can affect your cravings, appetite and hunger, not just your digestive function. This is something that can be assessed, or treated directly, especially if you have digestive symptoms, or have been on too many antibiotics through your life.
Alcohol intake - Although many people track their alcohol calories when they are trying to lose weight, too much alcohol in the evenings especially can impact sleep quality, metabolic rate, hormones and blood sugar. It's important to not neglect the potential role of regular alcohol in weight loss resistance too.
What’s Next?
If you’ve been doing “everything right” with nutrition and exercise but still experiencing weight loss resistance, it’s time to look deeper. Hidden factors like insulin resistance, metabolic dysfunction, thyroid imbalance, stress hormones, sleep quality, inflammation, and gut health can all block progress — and each of these can be properly assessed and addressed.
Working with a practitioner who understands metabolic health and resistant weight loss allows you to move beyond guesswork and into a targeted, personalized plan. This may include comprehensive bloodwork, metabolic and hormone testing, nutrition strategy, and step-by-step support to restore fat-burning capacity and metabolic balance.
You don’t have to stay stuck. With the right investigation and plan, progress is possible.
This is also exactly what my Metabolic Mastery program addresses - supporting you to finally make the lifestyle changes needed to reverse metabolic dysfunction.
Take the Metabolic Health Quiz: https://go.drshawnadarou.com/metabolicedgequiz
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Frequently Asked Questions (FAQs)
Can I lose weight if I have insulin resistance?
Yes! With a personalized plan addressing diet, movement, stress, and hormones, insulin resistance can be reversed and weight loss is achievable.
How do I know if thyroid is affecting my weight?
A comprehensive thyroid panel (TSH, free T3, free T4, TPO antibodies) is essential to uncover hidden thyroid dysfunction.
Is fasting helpful for weight loss resistance?
It depends on your hormonal status, stress levels, and metabolic health. Women often respond differently than men.
How long does it take to reverse insulin resistance?
Typically several months with consistent nutrition, exercise, stress management, and sleep support. Progress is gradual but measurable.
Are inflammatory foods really affecting weight loss?
Yes, foods like gluten, dairy, sugar, and eggs can trigger inflammation, cravings, and digestive disruption, making weight loss resistance worse.
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