Skip to main content

Creatas Images/Creatas Images

The question

How much caffeine is it okay to consume in a day?

The answer

Story continues below advertisement

Health Canada contends that a maximum intake of 400 milligrams of caffeine per day is safe for healthy adults – an amount found in about three small (8 ounce) cups of coffee.

Women of childbearing age should limit caffeine intake to 300 milligrams per day as some evidence suggest that heavy caffeine intakes increase the risk of miscarriage.

During pregnancy, I advise women to consume no more than 200 milligrams of caffeine per day.

Children should not consume more than 45 milligrams (4 to 6 years), 62.5 milligrams (7 to 9 years) and 85 milligrams (10 to 12 years) of caffeine per day.

Caffeine may have some health benefits. The caffeine in coffee helps treat asthma symptoms, enhances physical performance and boosts mental alertness. Coffee's protective effects against gallstones and Parkinson's disease are also attributed to caffeine.

But caffeine is not for everyone. Studies suggest that excess caffeine can boost blood pressure and heart rate, a concern for people with high blood pressure and heart disease.

In postmenopausal women who don't get enough calcium, consuming more than 400 milligrams of caffeine per day has been linked with having a lower bone density. (Caffeine increases the amount of calcium your kidneys excrete in the urine.)

Story continues below advertisement

And because individual caffeine tolerance varies widely, even a small amount can cause sleep disruptions, headaches and anxiety in some people.

If you need to cut back on caffeine, start by avoiding caffeine in the afternoon. Choose caffeine-free or decaffeinated beverages like herbal tea, mineral water, fruit and vegetable juice or decaffeinated coffee.

Reduce your caffeine intake gradually over a period of two to three weeks to help prevent withdrawal symptoms such as headache and muscle soreness.

Send dietitian Leslie Beck your questions at dietitian@globeandmail.com. She will answer select questions, which could appear in The Globe and Mail and/or on The Globe and Mail web site. Your name will not be published if your question is chosen.

Read more Q&As from Leslie Beck.

Click here to see Q&As from all of our health experts.

Story continues below advertisement

The content provided in The Globe and Mail's Ask a Health Expert centre is for information purposes only and is neither intended to be relied upon nor to be a substitute for professional medical advice, diagnosis or treatment.

Report an error Editorial code of conduct
Due to technical reasons, we have temporarily removed commenting from our articles. We hope to have this fixed soon. Thank you for your patience. If you are looking to give feedback on our new site, please send it along to feedback@globeandmail.com. If you want to write a letter to the editor, please forward to letters@globeandmail.com.

Welcome to The Globe and Mail’s comment community. This is a space where subscribers can engage with each other and Globe staff. Non-subscribers can read and sort comments but will not be able to engage with them in any way. Click here to subscribe.

If you would like to write a letter to the editor, please forward it to letters@globeandmail.com. Readers can also interact with The Globe on Facebook and Twitter .

Welcome to The Globe and Mail’s comment community. This is a space where subscribers can engage with each other and Globe staff. Non-subscribers can read and sort comments but will not be able to engage with them in any way. Click here to subscribe.

If you would like to write a letter to the editor, please forward it to letters@globeandmail.com. Readers can also interact with The Globe on Facebook and Twitter .

Welcome to The Globe and Mail’s comment community. This is a space where subscribers can engage with each other and Globe staff.

We aim to create a safe and valuable space for discussion and debate. That means:

  • Treat others as you wish to be treated
  • Criticize ideas, not people
  • Stay on topic
  • Avoid the use of toxic and offensive language
  • Flag bad behaviour

Comments that violate our community guidelines will be removed.

Read our community guidelines here

Discussion loading ...

Cannabis pro newsletter