US researchers have discovered that some people who are overweight have hidden fat inside their bones that could make them weak and prone to fractures.

The scans reveal some people carry fat in hidden places like the liver, muscles and bone marrow as well as their belly, hips or thighs.

The bone marrow is where the cells responsible for new bone formation – osteoblast cells – live.

Dr Miriam Bredella, who carried out the research, says that if more of the marrow is taken over by fat cells then this will weaken the bones.

"Obesity was once thought to be protective against bone loss. We have found that this is not true."

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