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Sitting 11 Hours a Day Increases Your Risk of Death by 48%

ByBryan JohnsonBlueprintLongevity

Hi friend,

Sitting for 11 hours/day increases your risk of death by 48%.

A lot of us hit that easily with office jobs and after-work couch time.

Compared to sitting for <4 hours/day:

  • sitting 4–8 hours/day increases your risk of death by 12%
  • sitting 8–11 hours/day increases your risk of death by 27%

In this email:

  • why sitting is so bad for you
  • how to measure sitting habits
  • how to sit less
  • 1 thing to counteract risk if you can't sit less

Why sitting is so bad for you

Sitting for long periods of time can weaken your muscles' ability to contract. This lack of contraction can affect metabolism, blood vessel health, and an enzyme called lipoprotein lipase that breaks down fats.

Lower activity levels of this enzyme may lead to increased triglycerides, and decreased insulin sensitivity. It can also lead to lower levels of HDL ("good") cholesterol. These are all risk factors for mortality.

Sitting for too long can decrease your energy expenditure too, which can contribute to weight gain, high blood pressure, and high blood sugar.

How to measure your sitting habits

It's easy to underestimate how much time you spend sitting down. If you have a wearable, keep yourself honest.

Wearables indirectly estimate sitting vs. active time through:

  • Daily strain/intensity minutes: Higher values mean more activity, lower values suggest prolonged sitting.
  • Step count/movement detection: Accelerometers distinguish sitting from movement. Low step counts over time indicate sitting.
  • Heart rate (HR): Resting HR often coincides with sitting, but is best used with accelerometer data as HR can also rise from other factors (e.g., digestion or stress).
  • Standing vs. sitting detection: Some wearables use posture recognition (accelerometer + gyroscope) to differentiate. Frequent micro-movements or step breaks can also be included.

If you don't have a wearable, spend 1–2 days roughly tracking your sitting time. Consider time spent at a desk, driving, eating, and watching TV.

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How to sit less

  • Move every ~30 min: Set a reminder to get up regularly to stand, stretch, or walk.
  • Consider a standing desk: If you work at a computer, switch between standing and sitting throughout your work day. Take phone calls standing up or suggest walking meetings, when possible.
  • Do active hobbies: Play a sport, ride a bike, go for a walk. Add more activity to your free time.
  • Add movement to daily routine: Take the stairs, park further away, stretch while watching TV. Whenever possible, choose movement.

If you can't sit less, prioritize daily exercise. Research suggests that ~60–75 min/day of moderate-intensity exercise may offset the increased risk of death associated with prolonged sitting.

When in doubt… get up and dance. Blueprint style.

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Be well, Blueprint

Originally published in Bryan Johnson's Blueprint newsletter (April 21, 2026). This content is for informational purposes only and is not medical advice. Consult your healthcare provider before starting any new wellness protocol.