Bones are much more dynamic than scientists once believed – they even have a daily rhythm

Your bones may seem permanent, but they're constantly being renewed. Every day, cells called osteoclasts break down old bone while osteoblasts build new bone to replace it. This remodeling process follows a daily rhythm, The Conversation reports — bone breakdown peaks earlier in the day, while bone formation peaks later. The hormone melatonin, often called a sleep hormone but actually triggered by darkness, helps coordinate this rhythm, suppressing breakdown while supporting building. As we age, these daily rhythms weaken, and scientists believe that's one reason osteoporosis and fractures become more common. Modern life, with artificial light and irregular schedules, may disrupt these rhythms further. Keeping regular sleep and wake times, getting daylight early in the day, and eating earlier in the evening can help — your bones have been keeping track of your timing all along.

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