Gregory Marcus

“On the other hand, caffeinated products might increase the frequency of early beats arising from the lower chamber of the heart called premature ventricular contractions (or PVCs), which may ultimately increase the risk for heart failure.”

Gregory Marcus · said 2026-07-20 · reported 2026-07-20

Marcus noted that caffeinated products might increase premature ventricular contractions, which could raise the risk for heart failure.

“While studies certainly have limitations and may yet be confounded by other factors despite the best attempts to perform appropriate statistical adjustment, evidence of benefit is greatest for risks of type 2 diabetes, atrial fibrillation (the most common heart rhythm disturbance), heart attack, and stroke,”

Gregory Marcus · said 2026-07-20 · reported 2026-07-20

Marcus discussed the evidence of benefit for conditions including type 2 diabetes, atrial fibrillation, heart attack, and stroke.

“Energy drinks have not been as thoroughly studied as caffeine occurring in natural substances (such as coffee or tea), but the available evidence suggests these drinks are more likely harmful than not,”

Gregory Marcus · said 2026-07-20 · reported 2026-07-20

Marcus commented on the evidence regarding energy drinks compared to caffeine from natural sources like coffee or tea.

“For the vast majority of individuals that currently enjoy consuming caffeinated coffee or tea, they should be reassured that these substances almost certainly are not increasing their cardiovascular risks and may instead have health benefits,”

Gregory Marcus · said 2026-07-20 · reported 2026-07-20

The American Heart Association issued a new scientific statement on the link between coffee and caffeine consumption and cardiovascular disease.