My husband is 34, yes he is overweight (don't know his BMI, but he's about 25 stone ish) and before this diagnosis he was referred to the NHS Health Trainer Service and is awaiting an appointment. He is aware he needs to loose weight and is taking his best steps to do this.
His diet varies if he's working he has a mcdonalds breakfast with a coffee, he will have a sandwich or some other convenience food eg KFC then when he comes home i cook a meal for us both. When he's on rest days he will have a sausage or bacon sandwich or Belvita breakfast biscuit, lunch would be a ham toastie or something like that, then something like chili con carne and roast potatoes or curry and roast potatoes or fajitas or gammon and roast potatoes. He's not a fan of rice or pasta or mashed/boiled potatoes, it tends to be bread he eats, if he's hungry he will get a nutella sandwich as a snack. He also has a very sweet tooth, am going to get some almond and coconut flour to try the recipes people have suggested.
When he's not at work he drinks either carbonated water, tap water, flavored no added sugar water or no added sugar dilute juice. When he's at work he has several coffee's a day, his job involves a lot of time sat in a car so this doesn't help either.
He doesn't like any veg apart from onions and mushrooms. Very tricky to find him healthy stuff to eat!