by Huffington Post Healthy Living Editors
According to the American Academy of Sleep Medicine, it takes about 30 to 60 minutes for caffeine to reach its peak level in the blood (one study found increased alertness can begin in as few as 10 minutes). The body typically eliminates half of the drug in three to five hours, and the remainder can linger for eight to 14 hours.
1. Decaf Isn’t the Same as Caffeine Free Think switching to decaf in the afternoon means you aren’t getting any of the stimulant? Think again. One Journal of Analytical Toxicology report looked at nine different types of decaffeinated coffee and determined that all but one contained caffeine. The dose ranged from 8.6mg to 13.9mg. (A generic brewed cup of regular coffee typically contains between 95 and 200mg, as a point of comparison. A 12-ounce can of Coke contains between 30 and 35mg, according to the Mayo Clinic.)