Fiona Phillips investigates the fortunes of M&S.

Fiona Phillips goes behind the scenes at Sainsbury's.

Journalist Fiona Phillips is on a mission to find out the truth behind the recent headlines on sugar. She discovers why some of us have more of a sweet tooth than others, which sugars you can enjoy guilt-free, why there is so much sugar hidden in food you would think was purely savoury and what effect sugary drinks have on the appetite. Fiona also helps four Brits, whose sugar-heavy diets could be putting their health at risk, to change their ways. From coming up with low-sugar recipes to finding ways to beat the sweet cravings, they will see whether cutting back to the levels suggested by health authorities is really achievable and what the benefits actually are.

We spend millions of dollars each year on products we're told are good for us, but does the science behind this industry raking in multi-millions really back up the claims?

Ali is a young Egyptian screenwriter determined to succeed in London, where he has been a student. He loves the artistic and political freedom, the colours, the music, the individualism. But he has little money, his student visa is about to expire and he has been thrown out of his lodgings. And so Ali moves in with a succession of eccentric and colourful London flatmates: Mark, a photographer with a very individual style, Linda, a young, blonde, very sexy model and Marilyn Monroe impersonator, and Miss Stevenson who is convinced that Ali is the reincarnation of her long dead Egyptian lover.