Do happy hormones exist? Is there a chemical recipe for improving your mood and is oxytocin really the biological basis of love?

Is humanity approaching a catastrophic decline in fertility. Are hormone-hijacking chemicals to blame for falling sperm counts? Should we be concerned and what can we do about it?

The menopause marks one of the biggest natural shifts in hormones for women and can bring with it a number of unpleasant symptoms. But is there a testosterone-based equivalent in men?

Are there really chemicals inside us that could lead to some age-defying interventions in the future? Could our hormones hold the map to the fountain of youth?

Does when you eat affect your body weight? Do meal-timing based diets like intermittent fasting really work? How are your hormones involved and does this new diet fad stand up to scientific scrutiny?

Ever wished that you could change your height? We investigate how hormones affect our height destinies, and what they have to do with the legend of the Irish giants.

There are chemicals all around us, but can they interfere with our hormones? Endocrine disruptors have been linked with a number of health problems, so for the final episode in the series we look at where these chemicals are found and whether we should be worried.

We all know what it's like to feel stressed, perhaps this year more than most, but what are our stress hormones really doing to our minds and bodies?

Doping scandals are a regular feature in sporting events, but how do the hormones involved boost performance and why are they banned? Plus, a short history of doping.

Vitamin D, the hormone in disguise, is currently in the spotlight as the world's favourite supplement, but is it really all it's cracked up to be?

We explore the hormones behind our sleep-wake cycle, how they can get out of sync and why some athletes are totally immune to jet lag.

How do our hormones impact our eating habits and will scientists ever make a diet pill? Plus, the tale of the Labradors and the impossible sausage.