Have you noticed more strands of hair on your brush or in the shower drain since starting a GLP-1 medication like semaglutide or tirzepatide? You are not alone. In my practice, clients often come to me feeling alarmed when body changes are accompanied by unexpected hair thinning. While many people are pleased with other changes, hair shedding is a frustrating experience that catches many off guard.
Why Might Hair Thinning Happen on GLP-1 Medications?
Hair shedding around rapid weight loss is thought to be a general response to a big change rather than something the medication does directly. It is often described as telogen effluvium. Research suggests that when the body goes through rapid weight loss or a sharp drop in food intake, a larger share of hair follicles can move early into a resting phase, with shedding showing up a few months later.
Because GLP-1 medications reduce appetite and slow gastric emptying, daily food intake often drops noticeably. Without some attention to what is on your plate, it becomes easy to miss out on nutrients that hair relies on. I work alongside your doctor on any shedding that is sudden, patchy or worrying you, and on your medication itself, while I look at the food side of the picture.
Nutrients Often Discussed in Relation to Hair
When appetite is small, the quality of each mouthful matters more. In my work as a GLP-1 nutritionist, I often see a few nutrient areas come up in food diaries:
- Protein: Hair is made largely of a protein called keratin, and protein foods provide the building blocks for it. When intake falls, hair growth may be affected.
- Iron: Iron helps carry oxygen around the body, including to the hair roots, and low iron is among the nutritional factors often associated with diffuse thinning. You can read more about food sources in my guide on foods rich in iron.
- Zinc: This trace mineral is involved in tissue repair and growth, including around hair follicles. Pumpkin seeds, pulses, eggs and shellfish are food sources.
- B vitamins and vitamin D: B vitamins support normal cell turnover and vitamin D is involved in follicle cycling. Eggs, dairy or fortified alternatives, oily fish and wholegrains all contribute.
I do not recommend or prescribe supplements. Research on supplements for hair in people without a confirmed shortfall is mixed, so I focus on what can realistically be added to meals.
Food Strategies to Support Your Hair
To look after your hair while eating less, nutrient density matters more than simple calorie counting. If you are also thinking about keeping muscle, protein foods and resistance activity work together, as I explain in my article on looking after lean mass on GLP-1s.
First, try to include a protein food in each meal or small snack. Eggs, Greek yoghurt, chicken, tofu, lentils and fish all provide amino acids. Spreading protein through the day is often easier than trying to fit it into one meal when you feel full quickly.
Second, pair plant-based iron sources such as dark leafy greens, pumpkin seeds and pulses with vitamin C-rich foods like peppers or berries, which may help absorption. Healthy fats from walnuts, chia seeds and extra virgin olive oil also fit well. These habits sit comfortably alongside a broader weight loss support approach, helping meals stay varied even when portions are small.
Patience and Personal Support
Hair growth cycles run on a delayed timeline. Once follicles enter the resting phase, shedding can continue for several months before new growth becomes visible. Eating regularly and with variety through that time is a kind step for your body, even though results are slow to show.
If you dread wash day and your small appetite makes meeting your own nutrition goals feel impossible, generic advice to "eat more protein" can fall short. One-to-one support can help you work out which foods you can tolerate and enjoy, and how to fit them into a smaller appetite. You can explore my services or get in touch through my contact page to book an online consultation.
