Tonight is the final episode of Body Story (World, 9pm), the incredible British series about what happens inside the human body. Appropriately, the series finishes with a double bill that covers the big topics: birth and death. In the first part, The Takeover, we see how a woman's body is completely reprogrammed during pregnancy to nourish and protect a growing foetus. In the second, we watch an 87-year-old man, slowly slip away. This evening is also the last part of Fat (World, 10 pm) which is possibly even better than Body Story, since it goes beyond description and well into analysis and comment on one of the biggest health issues of modern times. We have seen how fat makes some people prisoners in their own bodies, forced to have healthy organs chopped up in order to survive. There has been considerable discussion of the power of the food industry, which spends billions promoting food that no one needs. And last week, we saw how the mixed messages of Eat More and Stay Thin, provided by the media and food industry, have led to problems such as anorexia nervosa. This evening, in The Beauty Of Fat, a series of experts and individuals demonstrate that the medical profession is just as much to blame as everyone else for making fat people uncomfortable with their self-image. The idea that to be above or below a certain weight compared to one's height, is unhealthy, turns out to be twaddle. A stunning blonde, who works as a 'plus-size' model, now a size 14, describes starving herself down to size 4 to get work in the past. 'No one would even ask me out!' she says. 'It's like they thought I might break or something.' Dawn French, the British actress, describes almost being turned down by the adoption agencies, despite passing six months of investigation, because a doctor decided her (British) size 24 figure was unhealthy. And the doctor of David Alexander, clinically overweight and so super-fit he is currently training for the most demanding event of all, the triathlon, explains why he thinks Alexander is much fitter than skinny ballet dancers. There is also a brief interview with a huge Sumo champion in Japan, revered as a major sex symbol and national hero, who describes how much work he has to do to keep his body weight up. The most astonishing character is a tiny blonde woman called Gwen who helps people control their weight through what she calls Weigh-Down Workshops. 'We help people replace a love of food, with a love of God,' she says. Weigh-Down Workshops are now a multi-million dollar business, and apparently it works, at least as well as the painful operation described in episode one.