Important: GLP-1 medications are prescription drugs with real benefits and real side effects. They require assessment, monitoring, and a prescriber who knows your history. Nothing here is medical advice or a recommendation to take any medication.
What GLP-1 medications are
GLP-1 receptor agonists, including semaglutide and tirzepatide, mimic a gut hormone involved in appetite regulation, insulin release and gastric emptying. In clinical trials they have produced average body weight reductions of roughly 15% for semaglutide and around 20% for tirzepatide, substantially more than earlier weight medications achieved.
They are genuinely effective. They are also not a complete answer on their own. Weight regain after stopping is common, side effects lead some people to discontinue, and the medication does not address why metabolic dysfunction developed in the first place.
Where a functional medicine approach fits: not as an alternative to these medications, but alongside them. The question a thorough practitioner asks is what else is driving the picture, and what happens when the medication stops.
Why weight is rarely just intake and output
- Insulin resistance changes how the body stores fat and how hungry you feel
- Thyroid dysfunction alters metabolic rate, and is both common and underdiagnosed
- Sex hormone changes, particularly through perimenopause and menopause, shift where and how weight is carried
- Cortisol and chronic stress affect appetite, cravings and abdominal fat
- Sleep debt reliably increases hunger hormones and reduces satiety signalling
- Medications including some antidepressants, antipsychotics and steroids cause weight gain
- PCOS and other endocrine conditions make weight loss substantially harder
What a thorough workup usually includes
- Fasting insulin and HbA1c, not just fasting glucose, which can look normal well into insulin resistance
- A full thyroid panel rather than TSH alone
- Sex hormones where symptoms or life stage suggest it
- Lipids and inflammatory markers
- Nutrient status, particularly before and during rapid weight loss
- A plan for muscle preservation, since GLP-1 weight loss includes lean mass
- An exit plan for what happens if and when the medication stops
Worth asking directly: does this practitioner prescribe GLP-1 medication, monitor it properly, and have a plan beyond the prescription? Weight programmes that consist of a monthly script and a set of scales tend not to hold once the script ends.
What to look for in a practitioner
- Licensed to prescribe, if medication is part of what you want
- Tests metabolic markers rather than treating weight as the only data point
- Addresses muscle mass and nutrition during weight loss, not only the number on the scale
- Honest about regain risk and what maintenance actually requires
- Screens for underlying conditions such as thyroid disease and PCOS
