Spinal disc health declines with age — but the rate of decline depends almost entirely on load and movement patterns

Intervertebral discs have no blood supply in adults. They receive nutrients entirely through diffusion from the adjacent vertebral endplates, driven by cyclic loading and unloading during movement. Sustained static compression impairs this diffusion. The modern desk-sitting posture — lumbar flexion, thoracic kyphosis, cervical forward head — applies near-maximal disc pressure to the lower lumbar and lower cervical discs for sustained periods.

Protecting Disc Health

• Movement breaks every 45 minutes of sitting — the diffusion cycle requires alternating load and unload
• Lumbar support or active posture awareness in sustained sitting
• Core endurance training (planks, side planks, bird-dog) — the McGill Big 3 for spinal stability
• Avoiding lumbar flexion under load — hip hinge mechanics for all bending tasks
• Walking — the alternating loading is one of the most effective disc nutrition stimuli available