They write the diets at 3 years old? For shame, put your Big Girl/Mommy pants on, and abort the mini-revolution. You set their diets not the other way around.
#1 I do hope you are cutting their hot dogs up, as a grand/great grand I must preach now, do you know what hot dogs are named in E R's? Choke Steak, because they can shut off toddler airways. You are going to start adding salads to diet, crunchy carrotts, celery, some of the things when steamed or cooked gently don't even need sauces etc. Took a while for me to convince me I didn't need a cheese sauce on everything, veggies and fruits taste good, don't leave a sticky aftertaste in your mouth and it does your teeth good to chew a little. Its the wrong season now but consider a mini garden next year. My kiddos loved eating the lettuce and tomatoes they grew themselves. Doesn't have to take up a lot of space, can do it with planters and pits and window boxes. And if they see Mommy eat in this stuff, they will want to mimic you. They are still in the Mommy is Wonderful stage, try to convert a teenager that thinks the last Intelligent action you did was give,birth to them. Now that is a TASK! All of us Motherhood vets will be cheering you on!