Expert opinion from Carolina Castro

PhD Candidate (Health Services), Post Graduate Functional Clinical Nutrition, Bachelor's Degree Nutrition and Dietetics · 7 years of experience · Australia

Individuals that have any gastrointestinal issues as gastritis or ulcer should avoid drink coffee fasting, due to coffee acidity, it can make worse symptoms as abdominal pain and dyspepsia.

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Expert opinion from Cate F Keen

Bachelor of Health Science (Food & Nutrition) · 2 years of experience · Australia

Yes, you can drink coffee during a fast, especially if you are having a coffee without sugar or milk. Coffee on its own is low in calories and will not have a negative impact on your fasting efforts. Coffee in moderation may also have a positive effect on your mental alertness and concentration. Try to avoid consuming high doses of caffeine when you have limited food intake, this can contribute to feelings of anxiety, insomnia and potential gastrointestinal upsets.

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Expert opinion from Madison Deakin

Bachelor's degree, Nutrition and Food science · 3 years of experience · Australia

You sure can. You can drink a coffee during a fast because it's low in calories and sugar and would be very unlikely to break a fast. But be sure to only use black coffee.

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