Mae rhywfaint o gynnydd wedi cael ei wneud wrth leihau lefel yr alcohol sy'n cael ei yfed gan rai grwpiau oedran yng Nghymru, ond mae ymchwil yn dangos bod lefelau yfed ymhlith pobl ifanc yn parhau i beri pryder - roedd 17% o fechgyn a 14% o ferched 11 i 16 oed wedi yfed alcohol o leiaf unwaith yr wythnos yn 2009-10 (y data diweddaraf sydd ar gael).
There has been some progress in reducing alcohol consumption among some age groups in Wales but research shows that drinking among young people remains a concern - 17% of boys and 14% of girls aged 11 to 16 drank alcohol at least once a week in 2009/10. (the last data available).