How Stress and Other Conditions Can Affect Your Weight
The relationship between stress and body weight is genuinely complex. Acute stress can suppress appetite temporarily, leading to short-term weight loss. Chronic stress, however, tends to raise cortisol levels, which can increase appetite, promote fat storage — particularly around the abdomen — and disrupt sleep, all of which can work against progress on a GLP-1 journey.
Other factors people often ask about
Stress is far from the only thing that can shift the number on the scale unexpectedly. Several other conditions and circumstances are worth understanding:
- Digestive symptoms (such as diarrhoea or IBS): Frequent loose stools or an irritable bowel can reduce nutrient absorption and contribute to unintended weight loss. These symptoms are also commonly reported by people starting or increasing their GLP-1 dose, so it is worth noting patterns over time.
- Thyroid conditions and levothyroxine: An underactive thyroid (hypothyroidism) can slow metabolism and make weight loss harder. Levothyroxine, prescribed to treat hypothyroidism, does not directly cause weight loss, but correcting an underactive thyroid may allow more normal energy use — meaning weight changes can occur as thyroid levels stabilise. If you take levothyroxine and are also on a GLP-1 medicine, your prescriber or doctor is the right person to discuss how the two interact for you personally.
- Anaemia: Iron-deficiency or other forms of anaemia can cause fatigue and reduced appetite, which may contribute to unintentional weight changes. Anaemia itself is not a reliable or healthy route to weight loss.
- Diabetes: Poorly controlled blood glucose can lead to weight loss through mechanisms including increased urination and reduced ability to use glucose for energy. GLP-1 medicines are used in the management of type 2 diabetes, so if you have diabetes alongside a weight-management goal, your prescriber will be monitoring both.
- Smoking: Nicotine is an appetite suppressant, and some people notice weight changes after starting or stopping smoking. Neither smoking nor nicotine use is a safe or recommended approach to weight management.
If you are curious about how other medications might interact with your weight, the pages on antidepressants and weight changes and statins and weight cover those topics in more detail. For a broader look at what drives results on a GLP-1 medicine, the weight loss hub brings together the key topics in one place.
You may also find it useful to read about whether stress can directly cause weight loss, which looks at the physiological mechanisms in more detail.
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Frequently asked questions.
Stress can cause short-term weight loss by suppressing appetite, but chronic stress often has the opposite effect — raising cortisol, increasing hunger, and disrupting sleep. The impact varies between individuals, and unexpected weight changes are worth discussing with your prescriber or doctor.
Frequent diarrhoea can reduce nutrient absorption and contribute to unintended weight loss. IBS-related symptoms are also commonly reported on GLP-1 medicines. If digestive symptoms are persistent or severe, contact your healthcare professional rather than managing them alone.
Levothyroxine does not directly cause weight loss, but treating an underactive thyroid can allow metabolism to return toward normal, which may result in modest weight changes as hormone levels stabilise. Any weight effects should be discussed with your prescriber or doctor.
Both can contribute to unintentional weight loss — anaemia through reduced appetite and fatigue, and poorly controlled diabetes through impaired glucose use. Neither is a safe or intended route to weight loss; if you suspect either condition, speak with your healthcare professional.
GLP Trackr's daily check-in logs weight, sleep, mood, and energy each morning. The insights tools can highlight patterns — such as poor sleep coinciding with slower progress — giving you specific, data-backed points to raise with your prescriber rather than relying on memory.