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Chili & cayenne

Capsaicin — the heat that nudges metabolism a little and, applied to the skin, genuinely dulls pain.

Reviewed by Bodil Isaksson, Licensed Biomedical Scientist (Sweden)Last reviewed July 2026Food guide

FoodsHerbs & spicesMetabolism

The burn of chilli comes from capsaicin, which activates heat/pain receptors. Beyond flavour, it has a small metabolic effect and a well-established use in topical pain relief.

Key takeaways

  • Capsaicin gives a small, short-term boost to metabolism and satiety — real but minor for weight.
  • Topical capsaicin creams are an established treatment for nerve and arthritis pain.1
  • Chillies are rich in vitamin C and carotenoids.
  • Can irritate the gut and eyes; go easy if you have reflux or ulcers.

What it is

Capsaicin is the pungent compound in chilli peppers (Capsicum), acting on the TRPV1 “heat” receptor. Cayenne is simply dried, ground hot chilli.

The evidence

Dietary capsaicin produces a modest rise in energy expenditure and fat oxidation and can slightly reduce appetite — helpful at the margins, not a fat-burner. Topical capsaicin has good evidence for neuropathic and osteoarthritis pain.1

How to use

Enjoy chilli to taste in food. For pain, capsaicin is used as a cream/patch (not oral), under guidance.

Safety

Safe as food for most; can aggravate reflux, ulcers or IBS, and irritate skin and eyes. Wash hands after handling.

Bottom line: a flavourful metabolic nudge and a proven topical painkiller — enjoy the heat, but it’s no weight-loss shortcut.

References

Educational summary, not a prescription.

  1. Derry S, et al. Topical capsaicin (high concentration) for chronic neuropathic pain in adults. Cochrane Database Syst Rev. www.cochrane.org

This article summarises nutrition science for education and is not a substitute for individual medical advice.