Keto and cold hands and feet: causes and solutions

Many people report colder extremities when starting a ketogenic diet. This temporary effect relates to physiological changes as your body adapts to burning fat for fuel. The ketogenic diet shifts fluid balance and alters blood vessel function, which can make hands and feet feel chilly, especially in Britain’s damp climate.

Why keto affects circulation

Low-carb diets cause the kidneys to excrete more sodium and water initially. A 2013 study in the British Journal of Nutrition found this diuretic effect peaks in the first week (Bueno et al., 2013). With less blood volume, peripheral circulation decreases. The body prioritises core organs, leaving fingers and toes feeling cold. This typically resolves within 2-3 weeks as electrolyte balance stabilises.

Electrolyte solutions for UK ketoers

Sodium, potassium and magnesium all support vascular function. A half teaspoon of LoSalt (49% potassium chloride) from Tesco (£1.20 for 125g) added to broth helps maintain balance. Dark leafy greens provide magnesium – try frozen spinach from Iceland (85p per 900g) blended into soups. keto electrolyte supplementation explains ratios in detail.

What this means in practice

During colder months, layer up with thermal socks from M&S (£8 for 2 pairs) and fingerless gloves. Indoor heating costs averaging £2.50/day mean many Brits keep thermostats low. Warm drinks like bouillon (45p per cube at Sainsbury’s) boost both temperature and sodium intake. The NHS recommends maintaining room temperatures of at least 18°C for vulnerable groups.

When to seek medical advice

Persistent coldness with numbness or colour changes warrants a GP visit. Those with existing circulatory conditions should monitor symptoms carefully. Raynaud’s phenomenon affects 10% of UK women and may require adjusted approaches.

Frequently asked questions

Why do my hands get cold on keto but not my partner’s?

Individual differences in vascular response exist. Women generally have lower blood volume and higher rates of iron deficiency, exacerbating the effect.

Will supplements help warm my feet?

Magnesium citrate (300-400mg daily) and omega-3s from sardines (£1.15 at Aldi) support circulation. Avoid cheap magnesium oxide which has poor absorption.

How long until this side effect passes?

Most people adapt within a month. Ensuring adequate calories (minimum 1,800kcal for women) prevents excessive vasoconstriction from undereating.

The bottom line

Cold extremities on keto stem from temporary fluid shifts and vascular adaptation. Strategic electrolyte management, proper layering, and patience allow most people to overcome this phase. Tracking your nutrients becomes simpler with the Keto Dieting app available on Google Play and the App Store.

Educational only — not medical advice. This article is for general information. Speak to your GP before changing your diet, especially if you have type 1 or type 2 diabetes, kidney or liver disease, are pregnant or breastfeeding, or take medication for blood pressure, cholesterol, or blood glucose.

References

Bueno NB, de Melo IS, de Oliveira SL, da Rocha Ataide T (2013). Very-low-carbohydrate ketogenic diet v. low-fat diet for long-term weight loss: a meta-analysis of randomised controlled trials. British Journal of Nutrition. https://doi.org/10.1017/S0007114513000548
Hyde PN, Sapper TN, Crabtree CD, et al. (2019). Dietary carbohydrate restriction improves metabolic syndrome independent of weight loss. JCI Insight. https://doi.org/10.1172/jci.insight.128308