Jesper Bengtson
How many minutes of sun exposure you need for vitamin D, and why it depends on your skin tone
A 2024 modeling study puts a number on it, and it varies fivefold across skin tones.
How much protein you actually need to build muscle, and why the RDA falls short
Current research points to intakes well above the 0.8 g/kg guideline for muscle and healthy aging.
How fast your heart should recover after exercise, by age – and why a slow recovery predicts heart disease risk
A short pulse check after any workout reveals a heart risk many people miss.
The 30-second chair stand test: what a healthy score looks like at 60, 70, 80 and 90
A simple timed test tracks lower-body strength and fall risk in older adults.
How many push-ups should you be able to do? What the number reveals about your heart
A 10-year Harvard study suggests one of the simplest fitness tests may double as a heart-risk check.
Grip strength predicts how long you’ll live better than blood pressure, huge study finds
A study of 140,000 adults ranks grip strength above blood pressure as a mortality predictor.