Kids who are brought up in loving families are more likely to be tall like Peter Crouch, boffins say.
Scientist Barry Bogin reckons it is not just genes, diet or exercise that can make people grow huge like the former footie star.
The biological anthropologist says kids who have happy childhoods are less likely to have stun-ted growth.
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Prof Bogin, of Loughborough University, said: “The human species requires strong social and emotional attachments, that is love, between younger and older people, and people of all ages.
“These attachments are required to promote nearly all biological functions, such as food digestion and absorption into the body, a good immune system, and an overall happiness and positive outlook on life.”
He added that not being loved by those nearest causes “toxic emotional stress” which can block the hormones that help to boost growth.
It comes after the secret to evolution was apparently unlocked by a 33-year experiment involving yeast.
Boffins are continuing an experiment started in 1988 involving yeast being swirled in water before some is removed and the process repeated – and mutations have started to form.
The yeast started turning into "snowflake yeast", which means the scientists were producing genetically identical cells in each pot. The yeast also became multicellular.
Will Ratcliffe, who started the experiment, told the New York Times: "All of the lineages that we know of that evolved multicellularity, they made this step hundreds of millions of years ago, and we don’t have a lot of information about how single cells form groups."
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