Editor’s note: This newsletter will pause next Monday for the holiday. We’ll be back on Aug. 10.

Influencers have referred to the VO2 max fitness test as “the greatest predictor of lifespan,” but does it live up to the hype? Our reporter pushed himself to his physical limit to find out. Read more.

Good news coffee fans: The AHA says that 400 milligrams of caffeine a day – about three to five eight-ounce cups of coffee – is safe for most adults, and may even be good for your heart. Registered dietitian Leslie Beck breaks down the association’s new scientific statement. Read more. – Josie Mills

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