There's a tense and emotional swap in the feeding clinic as teenage comfort eater Victoria Madden goes head to head with fussy food avoider Hannah Pidgley, whose picky eating has already led to her being diagnosed with malnutrition. Hannah's terrified that her terrible diet is wrecking her fertility and her dreams of being a mum, while student nurse Victoria's huge meals and non-stop snacking sees her tip the scales at a mighty 19st 12lb. Dr Christian visits an American women's hospital to find out how obesity affects pregnancy and birth. Emma Woolf looks at eating disorders in older women.