A Matter of Fat is a 1969 documentary film by William Weintraub chronicling the efforts of a 358-pound man, Gilles Lorrain, to lose half his body weight as part of a hospital supervised weight loss program.In the film, Lorrain recounts his life and experiences, often with humour. In one 21-second time lapse sequence, Weintraub shows Lorrain's 150-pound weight loss, filmed at two frames a day for seven months.