"...research shows that for those without underlying conditions, pregnant, or under 12, consuming 3-4 cups (coffee) a day can help to reduce the risks of Alzheimer’s, certain cancers, Type 2 diabetes and cardiovascular diseases."
https://www.marketwatch.com/story/great-news-for-coffee-lovers-it-can-be-really-good-for-you-heres-how-to-boost-the-benefits-of-your-beans-11669402283?mod=article_inline
Pick your study, plenty to choose from.