The key is quantity and quality. For those consuming moderate amounts of coffee (3-4 cups/day providing 300-400 mg/d of caffeine), there is little evidence of health risks and some evidence of health benefits. However, some people, including persons with hypertension, osteoporosis, heart disease, pregnant women, children, adolescents, and elderly may be more vulnerable to the adverse effects of coffee.
At least, coffee is far less toxic and more healthier than the sugar-laden drinks like soda.
Each item includes a link to the original research. Link -Thanks, Karen!