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Gok Wan gives troubled teens the advice, confidence and self-belief they need to tackle their issues and anxieties.
Got advice for surviving your teens? Use #nakedtruth on Twitter
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Next on: Tuesday 14 February, 8PM on Channel 4
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The Embarrassing Illnesses doctors set off on a UK roadshow in an innovative attempt to raise health awareness and de-stigmatise 'embarrassing' body parts and medical conditions
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Last broadcast: Monday 17 October, 9PM on Channel 4
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Katie Piper explores the issues surrounding the pioneering surgery she's undergoing to regain the sight in her left eye
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Last broadcast: Tuesday 07 February, 9PM on Channel 4
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With 70 cameras filming round the clock for 28 days, 24 Hours in A&E offers unprecedented access to one of Britain's busiest A&E departments, at King's College Hospital
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Last broadcast: 10 August 2011, on
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Behind the scenes at one of the country's most outrageous gyms, where four extraordinary personal trainers battle to transform the physiques of their clients
More on The Fat Fighters
Last broadcast: Tuesday 24 January, 8PM on Channel 4
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New series examining the science behind using food in medicine, tackling patients' health problems through the food they eat
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Last broadcast: Tuesday 20 December, 8PM on Channel 4
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A series that follows seven people who are undertaking a range of gender affirmation procedures as they make the journey to realise their true identities
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Last broadcast: Tuesday 29 November, 10PM on Channel 4
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The Hospital examines the relationship between teenagers and the NHS. Consultants, surgeons, nurses and midwives speak with unprecedented candour about the problems they face
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Last broadcast: 23 August 2010, on
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Documentary series in which two extreme eaters - one very overweight and the other severely underweight - swap diets in an attempt to change the way they view food and eating
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Last broadcast: 17 May 2011, on
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As the nation's waist size spirals out of control, the Embarrassing Bodies doctors help the seriously overweight cope with illnesses caused by obesity
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Last broadcast: 27 June 2011, on
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The Embarrassing Bodies clinic helps answer the common questions and health concerns of teenagers
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Last broadcast: 29 July 2009, on
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Long-running documentary strand that investigates extraordinary and moving real-life stories about the extremes of the human body
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Last broadcast: 26 May 2011, on
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Oliver Cheetham's First Cut film meets Vicki, a mother-of-two diagnosed with young-onset Parkinson's, as she deals with her condition and the effect her medication is having on her life
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Last broadcast: Friday 12 August, 7.35PM on Channel 4
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A new live series showcasing medical diagnosis as Dr Christian Jessen and Dr Dawn Harper diagnose cases live on air
More on Embarrassing Bodies: Live from the Clinic
Last broadcast: 29 June 2011, on
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Commemorating the anniversary of the Chernobyl nuclear disaster, this documentary based on Mario Pertucci's poem tells the story of the people who dealt with the catastrophe at ground level
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The fascinating story of Mark Hogancamp who, brain-damaged and broke following a vicious attack, sought recovery in a second world war scale-model town he built in his garden
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Last broadcast: 19 April 2011, on
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This series investigates the extremes of discrimination. Each episode brings together two people often defined by the way they look: one has a facial disfigurement, the other an intense preoccupation with their appearance.
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Last broadcast: 09 March 2011, on
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What are the long-term effects on the human body of drastic crash diets? With the help of six slimmers, Dr Anu Bhatia investigates.
More on Will My Crash Diet Kill Me?
Last broadcast: 26 January 2011, on
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A brand new series exploring some of the extraordinary ailments and conditions that affect all creatures great and small - from pets to livestock and zoo animals
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Last broadcast: 01 December 2010, on
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In 1967, Dr Christiaan Barnard completed the world's first successful heart transplant. This factual drama, with Rupert Graves as Barnard, tells the story of this ground-breaking moment.
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Can Paul Mason, Britain's fattest man, get the surgery he needs to keep him alive? And will Paul's dream of walking again come true?
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Last broadcast: 05 January 2011, on
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The Lazarus Effect follows the stories of four people living with HIV/AIDS, whose lives have been transformed by antiretroviral medication
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First Cut follows two people with severe stammers on the McGuire Programme four-day intensive course, which helps people who stammer overcome their affliction
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With the increasing popularity of cosmetic surgery in the UK, Dr Christian Jessen shines a spotlight on the industry and comes to the aid of women who have fallen victim to botched operations
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More on The Ugly Face of Beauty
Last broadcast: 03 August 2010, on
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This moving documentary examines a life lived in the wrong colour skin. It focuses on three sufferers of albinism as they attempt to regain their confidence and discover their own identity.
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Kate Spicer undertakes a very personal investigation into the seductive world of the beauty industry, weighing the benefits of radical treatments against their costs by trying them out first-hand
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Four self-confessed fast food fans trade processed food and sugar-laden treats for the diet of one of the healthiest communities in the world
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Narcolepsy causes people to fall sleep uncontrollably many times each day. This documentary follows a group of British sufferers as they attend a 'Narcolepsy Network' conference in America.
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This landmark series follows nine autistic youngsters as they attempt to produce their very own stage show, under the guidance of theatre professionals who've never worked with an autistic cast before
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Music programme hosted by Lauren Laverne and Miquita Oliver featuring performances from Sugababes at the Fight Cervical Cancer in Style charity event to raise awareness of cervical cancer
More on T4 at Fight Cervical Cancer in Style
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This long-term series follows seven obese children for a decade, revisiting them every two years to discover what it's like to grow up as an obese child in Britain today
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In this unique experiment, nine 21st century volunteers subject themselves to the weight loss diets and fitness regimes of previous generations. But have they bitten off less than they can chew?
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Anna Richardson shows the nation how to lose extra pounds fast, encouraging viewers to join her in a special two-week diet and exercise regime
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Last broadcast: 12 January 2010, on
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A haunting True Stories documentary about the most popular suicide destination in the world - San Francisco's beautiful but deadly Golden Gate Bridge
More on The Bridge
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A hard-hitting documentary following an extraordinary six months in the life of Darcus Howe as he attempts to raise awareness of prostate cancer, a disease which affects one in four black men.
More on What's Killing Darcus Howe?
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The show that boldly goes where no one has gone before, tackling those sensitive medical problems that people would rather ignore than take to a doctor
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Three people addicted to different substances - alcohol, crack and benzodiazepine - attempt to kick their habits under the supervision of experts at a leading detox clinic
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A new series explores the lengths men are going to in the pursuit of physical perfection. With chiselled flesh and perfect grooming the norm, now it's men feeling the pressure to look great.
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Last broadcast: 28 May 2009, on
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A candid view of the highs and lows of alcohol that explores the drinking habits of young people by looking at six different stories from Saturday nights out
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Twelve overweight individuals set out to walk over 550 miles from Boston to Washington DC, for a prize of up to $1.2 million for whoever loses the most weight
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An intimate observation of disability. 18-year-old Dominic Hyams has brittle bones - but that's not going to stand in the way of a European adventure with his gang of able-bodied mates...
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In this Cutting Edge documentary, Sue Bourne tells the story of an ordinary day in modern Britain through the births, marriages and funerals that take place in one city over twenty-four hours
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Ray Gosling examines the enigma of middle age by talking to people about the challenges, experiences and opportunities it offers
More on The Middle Ages: Forty Something
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Formidable diet dictator Gillian McKeith turns her attention to big girls looking forward to their big day
More on 3 Fat Brides, 1 Thin Dress
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What's it like to hear voices, make yourself sick 15 times a day, or have electric shock treatment? Young people share their personal experiences of mental health problems.
More on A-Z of Your Head
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When TV producer Angela Howard-Bent was told that she had terminal breast cancer she decided to make a film about the last months of her life. This moving film is her very personal story about life and death.
More on Angela's Dying Wish
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This documentary explores all sides of the popular - and so-called 'miracle' - diet. From the people who are following it, to the science for and against it.
More on The Atkins Diet: Fat or Fiction
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Anatomist Dr Gunther von Hagens and pathologist Professor John Lee get right under the skin to reveal the processes in life that tie us to our ultimate fate in death
More on Autopsy: Life and Death
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Russell Brand hosts a studio debate looking at the issues surrounding drugs and addiction
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A provocative drama about an IVF mix-up which results in a white woman giving birth to a black boy
More on Born with Two Mothers