The show follows why some people are plagued by allergies, whilst others aren't and how it may be down to the Westernised culture.
s53e01 - Sugar v Fat
s53e02 - Swallowed by a Sink Hole
s53e03 - Man on Mars
s53e04 - The Power of the Placebo
s53e05 - How You Really Make Decisions
s53e06 - Living with Autism
s53e07 - 50th Anniversary
s53e08 - Where Is Flight MH370?
s53e09 - What's Wrong with Our Weather?
s53e10 - Should I Eat Meat? Part One
s53e11 - Should I Eat Meat? Part Two
s53e12 - Allergies
s53e13 - Inside the Dark Web
s53e14 - Ebola
s53e15 - Is Your Brain Male or Female?
Horizon is BBC Two's flagship 50-minute science documentary series.
Recognised as the world leader in its field, it regularly wins a sweep of international science, medical and environmental film accolades, and has recently won the Royal Television Society Award and the Prix Italia.
In 2002, the British Academy of Film & Television Arts presented Horizon with the BAFTA Television Award for Best Factual Series or Strand.
In 2003 it won the prestigious Images et Science award for best medical documentary and the Carl von Linne Award at the Living Europe film festival in Sweden. That year, a Horizon co-production with WGBH Boston won the Emmy for best documentary.
In September 2014 it celebrated its 50th anniversary and it continues to enjoy outstanding critical acclaim.