Drinking coffee isn’t going to have a huge impact on your calcium absorption, but it might have none at all with just one tablespoon of milk.
Study
PubMed: Effects of caffeine on bone and the calcium economy
Low calcium intake is clearly linked to skeletal fragility, and it is likely that a high caffeine intake is often a marker for a low calcium intake.
The negative effect of caffeine on calcium absorption is small enough to be fully offset by as little as 1-2 tablespoons of milk.
All of the observations implicating caffeine-containing beverages as a risk factor for osteoporosis have been made in populations consuming substantially less than optimal calcium intakes. There is no evidence that caffeine has any harmful effect on bone status or on the calcium economy in individuals who ingest the currently recommended daily allowances of calciu!
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