Coffee

Three to four cups a day. That is the dose associated with the largest reduction in cardiovascular disease, cancer, and all-cause mortality -- a consistent 17% lower risk of death compared to non-drinkers.

Why It Matters for Longevity

An umbrella review of 201 meta-analyses (Poole et al., 2017, PMID 29167102) found coffee consumption consistently reduces risk of all-cause mortality, cardiovascular disease, type 2 diabetes, Parkinson's, and several cancers. The UK Biobank study (>170,000 participants, PMID 35854551) confirmed 2-3 cups daily reduces cardiovascular disease incidence and mortality for ground, instant, and decaf alike. Both caffeinated and decaf show benefits, pointing to chlorogenic acids -- not caffeine -- as the primary active compounds.

Use a paper filter. Unfiltered methods (French press, boiled) leave diterpene oils (cafestol, kahweol) that raise LDL cholesterol. Paper removes 80-90% of these.

How to Use It

Drink between meals, not with food. Coffee polyphenols chelate non-heme iron and reduce absorption by 20-73%. Wait at least an hour after eating. Light roasts retain more chlorogenic acids than dark roasts. Freshly ground beans preserve volatile compounds best.

What to Pair It With

Flavor Profile

Bitter and complex. Light roasts are acidic and fruity; dark roasts are chocolatey and smoky. French press gives a full body; filter coffee is clean and bright.

The Science

Ding et al. (2014, PMID 24459154) showed a J-shaped curve with maximum cardiovascular benefit at 3-5 cups/day. The Loftfield UK Biobank study (2022, PMID 35854551) found ground coffee had the strongest protective association. Chlorogenic acids are hydrolyzed to caffeic acid in the gut, which is well absorbed. Caffeine half-life varies by CYP1A2 genotype -- fast metabolizers may benefit more.

Key Nutrients