Cymerodd 13,700 o oedolion a 2,600 o blant ran yn Arolwg Iechyd Cymru 2015. Dyma rai o'r prif ganlyniadau:Dywedodd 40% o'r oedolion eu bod wedi yfed mwy na'r hyn sy'n cael ei argymell ar o leiaf un diwrnod yn yr wythnos flaenorol, i lawr o 45% yn 2008, gyda 24% ohonynt yn dweud eu bod wedi goryfed mewn pyliauDywedodd tua 31% o’r oedolion eu bod wedi bod yn gorfforol egnïol ar bum  diwrnod neu ragor yn yr wythnos flaenorolDywedodd 17% o'r oedolion eu bod wedi trafod eu hiechyd eu hunain gyda meddyg teulu yn ystod y pythefnos flaenorol, a dywedodd 70% o'r oedolion eu bod wedi bod at y deintydd yn y ystod y 12 mis blaenorolDywedodd 94% o'r plant bod eu hiechyd cyffredinol yn dda iawn neu'n dda.
A total of 13,700 adults and 2,600 children took part in the Welsh Health Survey 2015. Other key results show:40% of adults reported drinking above the recommended guidelines on at least one day in the past week, down from 45% in 2008, including 24% who reported binge drinkingAround 31% of adults reported being physically active on five or more days in the previous week17% of adults reported that they had talked to a GP about their own health in the past two weeks, while 70% of adults reported attending a dentist in the past 12 months94% of children reported having very good or good general health.