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The puzzle of why humans are growing taller and reaching puberty earlier than ever before can be explained by a sensor in the brain, scientists say.

The average height in the UK rose by 3.9in (10cm) during the 20th Century, and up to 7.8in in other countries, as nutritional health improved.

But exactly how this happens has never been understood.

The discovery could lead to drugs to improve muscle mass and treat delayed growth, UK researchers say.

Scientists have known for a long time that humans with easy and reliable access to food tend to grow

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