If you see you dietician at the hospital you receive your treatment at the dietician can give you some protein/energy drinks to try and then if you want to order some you can. They help you gain weight because they have a bit of fat in them and also alot of good viatmins and minerals. You can buy Ensure I think its called? Well its a protein powder that you can buy from most chemists, you can add it to milk shakes, it thickens it up and you can't even taste the difference! The dietician told me to eat things that I normally wouldn't eat all the time, like have a chocolate bar for a snack nearly every day, things that are high in fat and sugar will make you put on weight. Well that's what I did, since I lost a bit of weight while having radiation and it sure helps put the weight back on. Hope that helps xx