170. Weight Loss and Metabolic Adaptation. Why weight loss is hard to maintain... but not impossible.

Written by Clinical Herbalist Donna Troy Cleary, March 6, 2026

Ever feel like your body has a mind of its own when it comes to weight loss? You're not alone. ​At Spiral Herbal Remedies, we believe in supporting your body’s natural wisdom with herbal blends and a holistic approach to well-being. In this blog, we dive into scientific insights about weight management and how your body responds to change.

Your Body has something called a"Settling Point."

The scientific explanation for gaining weight after a diet is related to evolution. ​​When you lose weight, your body perceives this change as a potential threat and activates multiple systems to restore your previous weight. Your body wants to maintain your weight within a certain range. When you try to change it through diet, exercise, or other means, your body actively works to pull it back to its previous baseline.

Metabolic Slowdown

This defense mechanism occurs in two ways.

• 1. Your body increases hunger hormones like ghrelin. This hormone diminishes signals that indicate you've eaten enough, food becomes more appealing, and the feeling of fullness is harder to achieve.

• 2. Your body slows down metabolically. Larger bodies generally burn more calories. However, in response to shrinking body tissue, there is a decrease in how our body uses energy. After a loss of fat and muscle mass, the body becomes more energy efficient, burning fewer calories than it did before the diet. This phenomenon is called metabolic adaptation.

How the Thyroid and Nervous System make this happen:

Metabolic adaptation is driven by biological mechanisms. When weight loss occurs, thyroid hormone levels decline. The thyroid regulates our metabolism and how quickly cells burn fuel. A drop in these hormones leads to a slower resting metabolic rate. At the same time, the sympathetic nervous system slows down. This is the system responsible for the "fight or flight." It plays a role in how we burn calories. These reactions are the body's effort to conserve energy, interpreting weight loss as a potential famine.

Evolutionarily, humans have developed a stronger defense against starvation than against abundance. Throughout most of human history, this has served us. However, we are challenged in an environment where there is an abundant supply of food.

Rapid Weight Loss and Adaptation

The intensity of metabolic adaptation can depend on how we lose weight. Studies suggest that slower, more moderate weight loss causes a less severe adaptation, whereas crash diets set you up for a rebound effect.

Exercise plays a role, too, but not how you might think. It's hard to burn as many calories during exercise as one could eliminate with even modest dietary changes. And even moderate exercise can stimulate appetite, negating the calories burned. To top it all off, our bodies adapt to exercise, burning fewer calories for the same amount of work over time.

For maintaining weight loss, exercise needs to be consistent. The National Weight Control Registry identifies regular exercise as one of the strongest predictors of sustained success. This is related to metabolic adaptation itself. Muscle tissue is metabolically active and burns more energy at rest than fat.

Of note: GLP-1 medications can lead to considerable weight loss, but they also reduce muscle mass along with fat mass. It is especially important to pair resistance exercise with the weight loss from these drugs to protect your muscle mass and prevent metabolic adaptation.

Your Environment:

Both genetics and your environment play a role in maintaining weight loss. Genetics may give you a predisposition for being overweight, but your environment determines the outcome. A comparative study of two genetically related groups was conducted that illustrates this point. A group of Native Americans living in the US consumed more processed foods and had a more sedentary lifestyle. This group had an extremely high obesity rate. Conversely, their genetic relatives, living in Mexico, who followed traditional diets and engaged in more physical labor, exhibited dramatically lower rates of obesity, despite the same genetic susceptibility.

We have a predisposition for energy conservation, which protected our ancestors during times of famine or earlier, as Hunters and Gatherers, which sustained us between food sources. We now operate in a world where constant caloric intake is possible. Willpower isn't enough. Structural changes in your home are needed, and here are some strategies:

• Don't shop when you're hungry. Shopping when hungry can impair your ability to make rational food choices. Hunger influences decision-making, often leading to the purchase of high-calorie and less healthy options. By shopping on a full stomach, you reduce the physiological drive that pushes you towards tempting, unhealthy foods.

• Enhanced Cognitive Control. When you are not hungry, your prefrontal cortex, which is responsible for executive functions like planning and self-control, is better equipped to guide your decisions. This allows you to stick to your shopping list and choose items that align with your long-term health goals, rather than succumbing to short-term cravings.

• Reframing. Another strategy involves allowing yourself to pick up the tempting food and saying to yourself. "I could buy this, but I'm choosing not to." ​​This strategy works through cognitive reframing. It fosters a sense of personal agency and control. ​Instead of feeling deprived or that you "can't" have something, which can increase desire, you acknowledge the option to indulge while deliberately choosing not to. It's empowering.

• Out of Sight, Out of Mind. If tempting foods are not in your home, you cannot eat them. ​This removes the constant visual cues and easy accessibility that can trigger cravings and impulsive consumption. ​Once processed foods are in your cabinet, the effort required to eat them is minimal, making resistance much harder.

• Reducing Decision Points: ​By making a choice at the grocery store, you eliminate countless future decision points at home. ​Each time you open your pantry or refrigerator and see a tempting item, you face a new decision to resist, which depletes your willpower. ​Proactive resistance at the store saves mental energy and reduces the opportunities for impulsive eating

  
  

• Move!: ​Moving plays a critical role in weight management and metabolic health. Physical activity moves glucose/calories from the bloodstream right into your muscles. This reduces how many of those calories are circulating in your blood and how many end up being stored as fat. This can help stabilize blood sugar levels.

  
  

  Incorporating movement into your daily routine—such as walking instead of driving, standing or dynamic workstations, or engaging in household tasks that involve crouching, bending, and walking can increase your caloric expenditure, not to mention flexibility.

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What This All Means

The key takeaway is not that weight loss is impossible or that your body is irreversibly working against you. It's about understanding that sustained weight loss is a long journey that involves strategies.

A gradual approach to weight loss, knowing that your body will resist, is key. Recognizing that an increase in hunger and a slowed metabolism is not personal failure, but what your body evolved to do. Invest in your environment by being strategic at the grocery store rather than relying solely on willpower. Build a home, a schedule, and routines where healthy choices become easy. The insight that successful individuals change their environment is perhaps the most actionable advice from decades of data.

Feeling inspired to support your body's journey naturally? We're here to help you explore herbal solutions for stress support, metabolic balance, and overall well-being. ​Visit spiralherbalremedies.com to discover our Organic, Lab-tested THC-free CBD for stress support, our Losing It Tea, to help control appetite and enhance digestion, or our Benjamin Button Got His Groove Back for energy and libido. Check out all of our herbal blends made by our Clinical Herbalist and Former Registered Nurse, Donna Cleary. And, if you're in Brooklyn, stop by our shop at 810 Washington Ave, in Brooklyn, New York. ​We're open M, W, Th, and F from 12-7 pm, and are located just a few blocks from the Brooklyn Museum, Zoo, Botanical Garden, and Prospect Park. We can't wait to help you on your herbal adventure!

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