Skin care during medical weight loss

Key takeaways

• Eating much less can show up in the skin within weeks: dryness, dullness and slower healing.
• Hair shedding two to four months after rapid weight loss is common and usually recovers.
• Loose skin depends on how much you lose, how fast, your age, sun damage and genetics.
• Some changes improve with weight loss, such as a dark velvety neck linked to insulin resistance.
• Protein, water, sunscreen and strength training do more for your skin than any cream.

Why does skin change during medical weight loss?

I have been on both sides of this. I do not like injections, and I still took a GLP-1 weight loss treatment myself, with the fine insulin-type needle. So when patients tell me, "Doctor, the weight is coming off, but my face looks tired," I understand exactly what they mean.

See, what happens is, these medicines reduce appetite strongly. Many people end up eating far less protein, fewer fruits and vegetables, and drinking less water, often without noticing. The skin is a fast-turnover organ. It shows a shortfall early. On top of that, fat loss from the face changes its volume and shape, and the whole body is under the stress of rapid change.

What changes are common, and why?

Hair shedding deserves a note. DermNet describes telogen effluvium, a shedding that typically appears two to four months after a trigger such as weight loss or a change in diet, and then usually settles over six to nine months as the trigger is removed. It is alarming, but it is usually temporary. My hair article on hair fall during weight loss has more.

Dark neck improving is one of the nicer changes. Acanthosis nigricans, the dark, thick skin in the neck and underarms, is mainly linked to insulin resistance. The NHS notes the patches usually fade once the cause is treated, and weight loss is recommended when weight is the cause. My article on dark neck explains this.

How do I protect my skin while I lose weight?

This is what I tell my weight-loss patients, and what I did myself:

1. Start every meal with protein. Dal, paneer, curd, eggs, soya, chana, sprouts, fish or chicken. When appetite is small, protein should come first, because skin, hair and muscle all depend on it.
2. Drink enough water through the day. Nausea and lower appetite make people forget. Keep a bottle at your desk.
3. Do not skip fats entirely. A little ghee, nuts, seeds or oil in cooking helps skin and the absorption of some vitamins.
4. Strength training two to three times a week. Muscle gives shape under the skin. Losing muscle makes loose skin look worse.
5. Sunscreen every morning. Sun damage weakens collagen and elastic fibres, and skin with good collagen adapts better to volume loss.
6. A simple routine: gentle wash, a moisturiser suited to your skin, sunscreen. Add a retinoid at night only if your doctor advises it and your skin tolerates it.
7. Sleep. Hard to measure, easy to see in the face.
8. Get blood tests if hair is shedding heavily. Iron, vitamin B12, vitamin D and thyroid are commonly checked, depending on your history.

Will I get loose skin?

That is very important to understand: nobody can tell you exactly. Loose skin depends on how much weight you lose, how quickly, your age, how much sun damage your skin has had, smoking, and your genes. Younger skin with less sun damage tends to adapt better. Very large weight loss may leave loose skin that only surgery can remove, and I will say so honestly if that applies to you.

What is in your control: - A sensible pace rather than the fastest possible pace - Protein and strength training, to keep muscle - Sun protection and not smoking

For the face specifically, some people notice hollowing of the cheeks and temples. My anti-ageing article on facial ageing after weight loss covers what can be done, and I prefer to wait until weight is stable before discussing any restorative treatment.

Which skin treatments make sense during weight loss?

Basically, I separate two phases.

While you are actively losing weight: keep to the basics above, treat acne or rashes if they appear, and avoid big structural treatments, because your face is still changing. Gentle medical facials or mild peels for dullness are reasonable if your skin is healthy.

Once your weight is stable for a few months: we can assess what remains, such as pigmentation, a dark neck, skin texture or volume loss, and plan treatments in order. This is the chess approach I use everywhere. Decide where you want to be, then work backwards.

How we approach this at Dr Tvacha

If you are on our Endgame Weight Programme, skin and hair are part of the monthly review conversation, because protein and pace matter for both. If you are losing weight elsewhere and your skin is struggling, the Second Layer Skin Plan at our Thane, Andheri, Bandra and Dahisar centres starts with a diagnosis, tests only where they will change the plan, and any treatment quoted in writing. For the bigger picture of face changes, see face and skin changes after weight loss.

Written by

Dr Amit KarkhanisAesthetic Physician · MBBS, Dip. Dermatology (UK) · Reg. No. 2001/02/1124

Founder of Dr Tvacha, practising in Thane since 2005. Leads the weight loss and hair programmes.