Eating well

Intermittent Fasting

Intermittent fasting means cycling between periods of eating and not eating, such as the 5:2 approach or limiting eating to a set window each day.

Written by Meds Global Health Clinical Team · Clinically reviewed by Dr Muhammad Suffyan, MB BS, Founder & Clinical Director · Last reviewed · How we review

What it means

Intermittent fasting is about when you eat rather than what you eat. Common approaches include the 5:2 (eating normally five days a week and much less on two), and time-restricted eating (limiting food to a window such as 8–10 hours a day).

Why it matters

For some people it can help with weight loss and may improve some health markers, mainly by helping reduce overall calorie intake. It is one option among many, and the quality of food still matters.

Practical tips

How to make it work

  • Choose an approach that fits your routine, such as an eating window or two lighter days a week.
  • On eating days or within your window, still aim for balanced, nutritious meals.
  • Stay well hydrated with water, and unsweetened tea or coffee, during fasting periods.
  • Build up gradually and notice how it affects your energy, mood and concentration.
  • Do not use fasting as a reason to overeat unhealthy foods at other times.
  • Combine it with a generally healthy diet and regular activity for the best effect.

Good to know. Intermittent fasting is not suitable for everyone — including people who are underweight, pregnant or breastfeeding, have diabetes on certain medicines, or have a history of disordered eating. Get medical advice first if any of these apply.

Answers

Intermittent Fasting: frequently asked questions

Is intermittent fasting better than other diets?

Not necessarily. For weight loss, it mainly works by reducing overall calories, and it is no more effective than other approaches for many people. The best plan is one you can sustain and that keeps your diet nutritious.

Who should avoid intermittent fasting?

It is not suitable for people who are underweight, pregnant or breastfeeding, some people with diabetes (especially on insulin or certain tablets), or anyone with a history of eating disorders. Check with your GP first if unsure.

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Education and reference only. This is general UK health guidance, not personal medical or dietitian advice. If you have a health condition or specific needs, check with your GP, pharmacist or a registered professional before making big changes.

Sources

Where this is drawn from

  • NHS — Eat well & Live Well
  • British Dietetic Association (BDA)
  • UK Scientific Advisory Committee on Nutrition (SACN)

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