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Can You Drink Water While Fasting?

Written by:

Obi Obadike

Obi Obadike

Celebrity Fitness & Nutrition Expert, CFT, SFN, M.S. Founder & CEO – Ethical Inc.
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Can you drink water while fasting? It is recommended to drink water while doing any type of unique intermittent fasting. Intermittent fasting is when you abstain from eating for certain periods of time. And that period can be 12 to 16 hours a day or 24 hours at once, twice or three times a week.

When you do any type of fasting it results in lower blood sugar and insulin levels. While eating solid foods increases your blood sugar levels and stimulates the secretion of insulin. Drinking water does not affect your blood or insulin levels and you can safely drink it during intermittent fasting.

Can you drink water while fasting? Photo credit: iStock-globalmoments

One of the negative things about drying fasting which means no water while you are fasting is the potential of extreme dehydration. Here are some friendly drinks if you don’t want to drink water when you are not fasting:

  • Lemon water
  • Flavored water
  • Sparkling water
  • Unsweetened tea
  • Black coffee

Here are some drinks to avoid while fasting:

  • Alcohol
  • Milk
  • Smoothies
  • Sports Drinks
  • Energy Drinks
  • Coffee with milk, cream, or sugar

Some of the dangers of water fasting are dizziness, nausea, headaches, low blood pressure, low energy, and productivity. 20 to 30% of your water comes from food. So, if you do regular fasting and water fasting at the same time the lack of hydration which will happen could cause an extreme dehydration issue to your body.

People who have the following medical conditions should not water fast.

  • Gout- Water fasting can potentially increase gout attacks.
  • Eating disorders. There are studies that have shown that fasting can encourage and heighten eating disorders.

Can you lose weight while fasting? Yes you can lose weight while fasting but once you start eating regular food any water weight you lose will come back.

Some of the reasons people water fast are:

  • To lose weight
  • Religious reasons
  • Getting ready for a medical procedure

If you move forward with water fast, it shouldn’t last longer than 24 to 48 hours. Any water fast longer than that should be under medical supervision. Several research studies have linked water fasting with improving your health such as lowering the risk of heart disease, diabetes and certain cancers.

The Bottom Line is drinking water while your fasting is not a bad thing to do. In fact if you don’t drink water while you are fasting it can cause extreme dehydration. 20 to 30% of your daily water intake comes from eating regular whole foods.

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References

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  2. Oates JR, Sharma S. Clear Liquid Diet. [Updated 2022 Aug 29]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2022 Jan-. Available from: https://www.ncbi.nlm.nih.gov/books/NBK538500/
  3. Bagherniya M, Butler AE, Barreto GE, Sahebkar A. The effect of fasting or calorie restriction on autophagy induction: A review of the literature. Ageing Res Rev. 2018 Nov;47:183-197. doi: 10.1016/j.arr.2018.08.004. Epub 2018 Aug 30. PMID: 30172870.
  4. Teong XT, Heilbronn LK. Evidence gaps and potential roles of intermittent fasting in the prevention of chronic diseases. Exp Gerontol. 2021 Oct 1;153:111506. doi: 10.1016/j.exger.2021.111506. Epub 2021 Aug 2. PMID: 34352288.
  5. Bagherniya M, Butler AE, Barreto GE, Sahebkar A. The effect of fasting or calorie restriction on autophagy induction: A review of the literature. Ageing Res Rev. 2018 Nov;47:183-197. doi: 10.1016/j.arr.2018.08.004. Epub 2018 Aug 30. PMID: 30172870.
  6. Teong XT, Heilbronn LK. Evidence gaps and potential roles of intermittent fasting in the prevention of chronic diseases. Exp Gerontol. 2021 Oct 1;153:111506. doi: 10.1016/j.exger.2021.111506. Epub 2021 Aug 2. PMID: 34352288.
  7. Brandhorst S, Choi IY, Wei M, Cheng CW, Sedrakyan S, Navarrete G, Dubeau L, Yap LP, Park R, Vinciguerra M, Di Biase S, Mirzaei H, Mirisola MG, Childress P, Ji L, Groshen S, Penna F, Odetti P, Perin L, Conti PS, Ikeno Y, Kennedy BK, Cohen P, Morgan TE, Dorff TB, Longo VD. A Periodic Diet that Mimics Fasting Promotes Multi-System Regeneration, Enhanced Cognitive Performance, and Healthspan. Cell Metab. 2015 Jul 7;22(1):86-99. doi: 10.1016/j.cmet.2015.05.012. Epub 2015 Jun 18. PMID: 26094889; PMCID: PMC4509734.
  8. Guelinckx I, Tavoularis G, König J, Morin C, Gharbi H, Gandy J. Contribution of Water from Food and Fluids to Total Water Intake: Analysis of a French and UK Population Surveys. Nutrients. 2016 Oct 14;8(10):630. doi: 10.3390/nu8100630. PMID: 27754402; PMCID: PMC5084017.
  9. Taylor K, Jones EB. Adult Dehydration. [Updated 2022 Oct 3]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2022 Jan-. Available from: https://www.ncbi.nlm.nih.gov/books/NBK555956/
  10. Ogłodek E, Pilis Prof W. Is Water-Only Fasting Safe? Glob Adv Health Med. 2021 Aug 5;10:21649561211031178. doi: 10.1177/21649561211031178. PMID: 34414015; PMCID: PMC8369953.
  11. Liang Q, Wang XY, Hu HF, Lai JB, Yao WL, Chen ML, Rao X. [Correlation between fasting C-peptide and serum uric acid in patients with type 2 diabetes mellitus]. Nan Fang Yi Ke Da Xue Xue Bao. 2018 Apr 20;38(4):490-495. Chinese. doi: 10.3969/j.issn.1673-4254.2018.04.20. PMID: 29735453; PMCID: PMC6765660.
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