• Weil Nutrition Corner
  • Meet Dr. Weil
  • Origins
  • Healthy Aging
  • Marketplace
  • Podcasts
  • Accessibility
  • Subscribe
Dr. Weil Logo Dr. Weil Logo Weil™ Andrew Weil, M.D.
  • Health & Wellness
    Health & Wellness
    Body, Mind & Spirit
    • Addiction
    • Allergy & Asthma
    • Autoimmune Disorders
    • Back Pain
    • Bone & Joint
    • Cancer
    • Colds & Flu
    • Dental & Oral
    • Diabetes
    • Disease & Disorders
    • Ears, Nose, & Throat
    • Feet
    • Gastrointestinal
    • Hair, Skin, & Nails
    • Headache
    • Heart
    • Insects & Parasites
    • Liver & Kidney
    • Mental Health
    • Pregnancy & Fertility
    • Respiratory
    • Sexual Health
    • Sleep Issues
    • Stress & Anxiety
    • Vision
    Balanced Living
    • Exercise & Fitness
    • Gardening
    • Healthy Home
    • Healthy Living
    • Meditation & Inspiration
    • Meet Dr. Weil
    • Pets & Pet Care
    • Technology
    • Wellness Therapies
    Health Centers
    • Aging Gracefully
    • Children
    • Condition Care Guide
    • Men
    • Women
  • Diet & Nutrition
    Diet & Nutrition
    Anti-Inflammatory Diet & Pyramid
    Cooking & Cookware
    Diets & Weight Loss
    Food Safety
    Nutrition
    Recipes
  • Vitamins, Supplements & Herbs
    Vitamins, Supplements & Herbs
    Herbs
    Supplements & Remedies
    Vitamins
  • Ask Dr. Weil
  • Blogs
    Blogs
    Bulletins
    Health Tips
    Spontaneous Happiness
  • Mushrooms
  • Sleep
Press "Enter" to search
Dr. Weil Logo Weil™ Andrew Weil, M.D.
  • Health & Wellness
    Health & Wellness
    Body, Mind & Spirit
    • Addiction
    • Allergy & Asthma
    • Autoimmune Disorders
    • Back Pain
    • Bone & Joint
    • Cancer
    • Colds & Flu
    • Dental & Oral
    • Diabetes
    • Disease & Disorders
    • Ears, Nose, & Throat
    • Feet
    • Gastrointestinal
    • Hair, Skin, & Nails
    • Headache
    • Heart
    • Insects & Parasites
    • Liver & Kidney
    • Mental Health
    • Pregnancy & Fertility
    • Respiratory
    • Sexual Health
    • Sleep Issues
    • Stress & Anxiety
    • Vision
    Balanced Living
    • Exercise & Fitness
    • Gardening
    • Healthy Home
    • Healthy Living
    • Meditation & Inspiration
    • Meet Dr. Weil
    • Pets & Pet Care
    • Technology
    • Wellness Therapies
    Health Centers
    • Aging Gracefully
    • Children
    • Condition Care Guide
    • Men
    • Women
  • Diet & Nutrition
    Diet & Nutrition
    Anti-Inflammatory Diet & Pyramid
    Cooking & Cookware
    Diets & Weight Loss
    Food Safety
    Nutrition
    Recipes
  • Vitamins, Supplements & Herbs
    Vitamins, Supplements & Herbs
    Herbs
    Supplements & Remedies
    Vitamins
  • Ask Dr. Weil
  • Blogs
    Blogs
    Bulletins
    Health Tips
    Spontaneous Happiness
  • Mushrooms
  • Sleep
  • Weil Nutrition Corner
  • Meet Dr. Weil
  • Origins
  • Healthy Aging
  • Marketplace
  • Podcasts
  • Accessibility
  1. Home
  2. Diet & Nutrition
  3. Diets & Weight Loss

Is Fasting Right for You?

I started fasting once a week, but I had to give it up because I was getting severe headaches. Could you suggest anything I can do to prevent the headaches and continue fasting?

Andrew Weil, M.D. | September 29, 2003

Relaxed young woman lying on couch.
1 min

Updated on 3/21/2005

You don’t say why you want to fast once a week. I have experimented with fasting one day a week as a useful physical and psychological discipline. Many people experience a clearer mental state and increased energy after a short-term fast. When I did my weekly one-day fasts, I consumed nothing but water or herb tea. The first thing I would ask is how much water you were drinking during your fast. You should be drinking at least eight 8- to 12-ounce glasses of water or unsweetened herbal tea. Drinking less than that might explain your headaches.

I hope you were not fasting in an effort to lose weight. Fasting isn’t an effective diet tool – it alters your metabolism in a way that actually may make it harder for you to lose weight. Most people compensate for the deprivation of the fast by increasing their caloric consumption afterward.

If you’re a coffee drinker or normally consume beverages that contain caffeine, your fasting headaches could be the result of caffeine withdrawal. If that’s the case, I would suggest weaning yourself off caffeine before trying to fast again.

Not everyone does well with fasting – thin people and those who are particularly sensitive to cold have a more difficult time. If that’s the case, you probably should reconsider fasting. I would also caution about being overly active during a fast. Not only should you rest your digestive system, but you should also take time to rest your entire body. Too much physical activity during this time may also be a cause of headache.

Andrew Weil, M.D.

Dr. Weil on Healthy Aging

Start Your 14-Day Free Trial

Free Newsletters

Stay Connected With Dr. Weil

Anti-Inflammatory Diet

Follow Dr. Weil’s Food Pyramid

Get Dr Weils Newsletter Updates

Exclusive Lifestyle, Nutrition & Health Advice

Dr. Weil's FREE health living advice delivered to you!

By clicking "Subscribe," you agree to the DrWeil.com Terms and Conditions and Privacy Policy. You also agree to receive emails from DrWeil.com, and you may opt out of DrWeil.com subscriptions at any time.

Trending Now

An athlete is riding a bicycle on road. The man is wearing black bike shorts and shin guards along with a red sleeveless top and a red and white helmet and sunglasses. The image is blurred in motion.
Diets & Weight Loss

7-Keto: Supplement to Speed Metabolism?

A Flexitarian Diet | Diets & Weight Loss | Andrew Weil, M.D.
Diets & Weight Loss

A Flexitarian Diet

A Green Mediterranean Diet? | Diets & Weight Loss | Andrew Weil, M.D.
Diets & Weight Loss

A Green Mediterranean Diet?

Does Weight Loss Prevent Breast Cancer? |Women | Andrew Weil, M.D.
Diets & Weight Loss

A Hormone to Promote Weight Loss?

Dr. Weil Logo Weil™ Andrew Weil, M.D.
Dr. Weil's Signature

Exclusive Lifestyle, Nutrition & Health Advice

  • About Us
  • Press Information
  • Advertising
  • Contact Us
  • Terms of Use
  • Privacy Policy
  • Accessibility

Terms of Use | Privacy Policy

Information on this website is provided for informational purposes only and is not intended as a substitute for the advice provided by your physician or other healthcare professional. You should not use the information on this website for diagnosing or treating a health problem or disease, or prescribing any medication or other treatment. Any third party offering or advertising on this website does not constitute an endorsement by Andrew Weil, M.D. or Healthy Lifestyle Brands.

© Copyright 2025 Healthy Lifestyle Brands, LLC. All rights reserved. Reproduction in whole or in part without permission is prohibited. www.drweil.com