Hormonal Imbalances and Weight Gain: Causes, Tests and Help in Canada
Hormones can make weight harder to manage, but true hormone disorders explain only part of the picture. Knowing which tests matter helps you get answers faster.
SteroidsCanada.org editorial teamUpdated · 2 min read
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“It must be my hormones” is one of the most common things people say about weight they cannot shift. Sometimes it is true. Hormones influence hunger, energy use and where fat settles. But for most people, hormones are one factor among several, and finding out which ones matter takes a few specific tests rather than a guess.
The hormones that matter most
| Hormone or condition | Typical signs | Test to ask about |
|---|---|---|
| Underactive thyroid | Fatigue, cold intolerance, modest weight gain | TSH, free T4 |
| Insulin resistance, prediabetes | Belly fat, cravings, dark skin patches on neck | HbA1c, fasting glucose |
| Polycystic ovary syndrome (PCOS) | Irregular periods, acne, excess hair | Testosterone, LH/FSH, glucose |
| Low testosterone (men) | Low libido, fatigue, more fat, less muscle | Two morning total testosterone tests |
| Menopause | Hot flashes, sleep problems, fat shifting to the middle | Usually diagnosed by symptoms and age |
| Excess cortisol (rare) | Round face, purple stretch marks, easy bruising, high blood pressure | Specialised tests ordered by a doctor |
Our thyroid and weight guide covers the thyroid in more detail.
Weight and hormones go both ways
Excess body fat itself changes hormones. Fat tissue converts testosterone to estrogen, lowers sex hormone-binding globulin and worsens insulin resistance. That is why losing fat often raises testosterone in men and improves cycles and fertility in women with PCOS. Treating the hormone and treating the weight usually work best together.
Sleep and stress
Short sleep raises the hunger hormone ghrelin, lowers the fullness hormone leptin and increases cravings for high-calorie food. Chronic stress does something similar. Neither is a disease, but both are powerful, and fixing them is free. See our guides to sleep and stress eating.
Medicines that affect weight
Several common medicines can add weight, including some antidepressants and antipsychotics, oral corticosteroids such as prednisone, insulin and some other diabetes medicines, and certain seizure and migraine treatments. If you suspect a medicine, ask your prescriber about alternatives. Do not stop on your own.
What to ask your doctor
- Describe your symptoms and how your weight has changed over time.
- Bring a list of all medicines and supplements.
- Ask about TSH, HbA1c, a lipid panel and, depending on your symptoms, sex hormones.
- Ask whether a referral to a dietitian, an obesity medicine clinic or an endocrinologist makes sense.
Obesity Canada’s clinical guidelines describe obesity as a chronic condition and support access to medical treatment, including medications and surgery, for people who qualify. Many provinces offer free dietitian advice by phone.
Men: testosterone and belly fat
In men, excess abdominal fat and low testosterone are closely linked. Fat tissue converts testosterone to estrogen and lowers the protein that carries testosterone in the blood, and low testosterone makes it easier to store fat. Studies show that losing a significant amount of weight raises testosterone in many men, sometimes enough to avoid treatment. Anyone considering testosterone because of weight should start with a proper diagnosis.
What still matters most
Even with a diagnosed hormone condition, energy balance still decides weight change. Protein at each meal, strength training, daily steps, consistent sleep and a modest calorie deficit work alongside medical treatment. The macro calculator gives a starting point you can adjust from real results.
Questions
Can stress hormones make me gain weight?
Chronic stress and poor sleep raise appetite and cravings. True excess cortisol (Cushing syndrome) is rare and has distinctive signs like a round face, easy bruising and purple stretch marks.
What is insulin resistance?
When cells respond poorly to insulin, the body makes more of it. It is linked to belly fat, prediabetes and PCOS, and improves with weight loss, activity and sometimes medication.
Does low testosterone cause weight gain in men?
Low testosterone is linked to more body fat and less muscle, and excess body fat can lower testosterone in turn. Losing fat often raises testosterone.
Which medicines can cause weight gain?
Some antidepressants, antipsychotics, corticosteroids, diabetes medicines such as insulin, and some seizure medicines. Never stop a medicine without talking to your prescriber.
Sources
General information, not medical advice. Written for adults in Canada. Anabolic steroids are Schedule IV under the Controlled Drugs and Substances Act. Talk to a licensed healthcare provider and get bloodwork before using any compound.
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