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30th November 2017
04:10pm GMT

Professor Patrick Chappell of Oregon State University says the effect of obesity on metabolic syndromes can profoundly affect fertility.
He explained: "Either extreme of the spectrum, anorexia or obesity, can be associated with reproduction problems."
One theory is that our diets play havoc with our body clocks, causing changes in the balance of our hormones.
Disrupted sleeping patterns and sleep-awake cycles can influence the secretion of hormones such as cortisol, testosterone and insulin.
Early onset puberty has also been associated with higher rates of anxiety in girls.