A new study, presented at the American Heart Association, has shown that people who drink decaf have higher levels of a protein linked to heart diseases risk than those who drink caffeinated or no coffee.
The 187 participants were given pre-measured bags of coffee to use in their coffee machines, which were provided by the researchers. They agreed to drink it black with no sugar and undergo periodic blood tests, so the researchers could keep track of exactly how much caffeine they drank.
The participants were assigned to one of three groups: no coffee, three to six cups a day of caffeinateeld coffee, or three to six cups of decaf a day. Participants also kept journals so researchers could determine whether eating habits influenced the results.