Jesper Bengtson
The 6-minute walking test: See how you compare in your 60s, 70s or 80s
A hallway, a stopwatch and six minutes reveal more about aerobic age than most gym tests.
Most people think they need more protein – 350 studies suggest otherwise
A sweeping new analysis pushes back against the high-protein diet trend and brand-new US guidelines.
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.