The Chief Medical Officer for Wales is warning that we might need to consider new legal rules to control the size of fizzy drinks and food portions.
The move is being suggested as a way of stopping obesity levels reaching epidemic proportions.
Our correspondent Richard Morgan has more.
More top news
The morning will be mostly dry with some bright or sunny spells. However, cloud will thicken from the west during the afternoon.
Kenyans Eliud Kipchoge and Vivian Cheruiyot won the men's and women's races respectively, in a scorching hot London Marathon.
Most areas will have a dry night with some clear spells.