The Effects of Caffeine on Fertility

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Reproductive studies have found a link between high levels of caffeine consumption by women and delayed conception. In a study by Hatch, women who consumed more than 300 mg of caffeine per day were twice as likely to have conception delayed for one year or more.

Hatch EE, Bracken MB (1993). Association of delayed conception with caffeine consumption. American Journal of Epidemiology, 138(12), 1082-092

Another study also linked high caffeine intake to delayed conception, but only in women consuming 500 mg or more (about four cups of coffee) per day.

Bolumar F, Olsen J, Rebagliato M, Bisanti L, and the European Study Group on Infertility and Subfecundity (1997). Caffeine intake and delayed conception: a European multicenter study on infertility and subfecundity. American Journal of Epidemiology, 145(4), 324-334.

Caffeine in Beverages and Chocolate

Item Milligrams of Caffeine

Average Range
Brewed, drip method 184 96-288
Brewed, percolator 128 64-272
Instant 104 48-192
TEA (8-oz. cup)    
Brewed, major U.S. brands 64 33-144
Brewed, imported brands 96 40-176
Instant 48 40-80
Iced (12-oz. Glass) 70 67-76
Caffeinated soft drinks (12 oz.) 36 30-60
Hot cocoa (12 oz.) 6.4 3.2-32
Chocolate milk beverage (8 oz.) 5 2-7
Milk chocolate (1 oz.) 6 1-15
Dark chocolate, semi-sweet (1 oz.) 20 5-35
Baker's chocolate (1 oz.) 26 26
Chocolate-flavored syrup (1 oz.) 4 4
Source: U.S. FDA and National Soft Drink association


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