how much caffeine can you have in a week?
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As a general rule, you can assume that an average 8-ounce (240-ml) cup of coffee offers around 100 mg of caffeine. Several sources suggest that 400 mg of caffeine per day — the equivalent of 4 cups (945 ml) of coffee — is safe for most healthy adults ( 3 , 5 ).
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A normal dose of caffeine is about 50 mg to 200 mg. Caffeine works best when you take it on an intermittent, off-and-on basis. Higher doses can have much more potent effects. A dose of 500 mg or 600 mg of caffeine can affect you much like a low dose of an amphetamine.
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Coffee is the biggest dietary source of caffeine. You can expect to get around 95 mg of caffeine from an average cup of coffee.
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… and it's possible to have too much. Research shows that about three to six milligrams of caffeine per kilogram of body weight is all you need to see benefits. (For a 150-pound person, that's roughly 12 ounces of strong coffee.)
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Up to 400 mg of caffeine per day (or about 2 caffeine pills) is generally deemed safe for most adults.
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An 8-ounce (230-ml) cup of green tea contains between 30 and 50 mg of caffeine. The recommended maximum amount of caffeine per day is 400 mg, which is the equivalent to around 8 cups of green tea. However, it's best that you don't drink 8 cups at one time, especially if you are sensitive to caffeine.
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We don't know a lot about the effects of caffeine during pregnancy on you and your baby. So it's best to limit the amount you get each day. If you're pregnant, limit caffeine to 200 milligrams each day. This is about the amount in 1½ 8-ounce cups of coffee or one 12-ounce cup of coffee.
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Up to 400 milligrams (mg) of caffeine a day appears to be safe for most healthy adults. That's roughly the amount of caffeine in four cups of brewed coffee, 10 cans of cola or two "energy shot" drinks.
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Assuming an average of about 150, three to five cups contain 450 to 750 milligrams of caffeine. In other words, the upper limit of the healthiest consumption range in these studies is equivalent to more than three 24-ounce cans of Monster energy drink per day.
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Caffeine is a stimulant that can lead to anxiety and digestive problems if over-consumed. A large serving size contains 30 fluid ounces and 180 milligrams of caffeine, which is within the range of moderate caffeine consumption considered safe.
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Like so many foods and nutrients, too much coffee can cause problems, especially in the digestive tract. But studies have shown that drinking up to four 8-ounce cups of coffee per day is safe.
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Should I limit caffeine during pregnancy? If you're pregnant, limit the amount of caffeine you have to 200 milligrams (mg) a day. This is about the same as 2 mugs of instant coffee.
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Though babies can't process caffeine as quickly as adults, breastfeeding mothers can still consume moderate amounts. You can safely have up to 300 mg of caffeine per day — or the equivalent of two to three cups (470–710 ml) of coffee.
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Though caffeine has benefits, health authorities recommend watching your intake during pregnancy. Most experts agree that caffeine is safe during pregnancy if limited to 200 mg or less per day. This equals about 1–2 cups (240–580 mL) of coffee or 2–4 cups (540–960 mL) of caffeinated tea.
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According to the Dietary Guidelines for Americans, it's safe for most women to drink three to five cups of coffee a day with a maximum intake of 400 milligrams of caffeine. (Caffeine content can vary depending on the type of coffee, but an average 8-ounce cup has 95 milligrams.)
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The FDA's official stance is that caffeine is safe for consumers up to 400mg/ daily. To date, they allow caffeine to be added to beverages and food as long as it is listed in the ingredients panel. However, products are not required to list the amount of caffeine that they contain.
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250–300 mg of caffeine a day is a moderate amount. That is as much caffeine that is in three cups of coffee (8oz each cup). More than 750–1000 mg a day is a significant amount, but is very unlikely to kill someone. The Lethal Dose 50 of caffeine is 192 mg per kilogram, in rats.