From the explosion in sport food and drink, to the food diaries and routines of some of the UK’s top athletes, Leyla Kazim investigates food in the world of sport today.

How do elite sport nutritionists prep their athletes and what can we learn from them? What should we eat for energy? What’s the deal with protein? We hear from sport stars in rugby, netball, triathlon and football, to find out.

For an everyday athlete without a performance nutritionist, eating for sport can be confusing. Over a pre workout lunch, sport nutritionist Matt Gardner answers some Food Programme listener questions and shares stories from his days working with elite rugby players and extreme adventurers.

But sport food is no longer just the domain of gym cafes and sport clubs. There has been an explosion of energy drinks and 'hi protein' bars sold anywhere from Post Office counters to the check outs of sport fashion shops. Leyla sends three young food activists, who have been looking into this issue, out onto the streets of Reading to see what they can find on sale. Producer Nina Pullman takes their findings to professor of nutrition and metabolism at the University of Bath, Javier Gonzalez, who looks at the ingredients in more detail.

To explore the bigger links between sport, public health and food marketing, next we drop in on public health policy consultant, Dan Hunt, who explains the appeal of sport from a commercial point of view. Finally, Leyla reflects on how food works as fuel, ahead of the summer of sport to come.

Produced by Nina Pullman for BBC Audio in Bristol.