I'm a vegetarian. DH is a steak-aholic. DS-3 is a very picky eater and will not touch meat. DD-8 months will eat anything she can get her hands on. We all coexist in one household, happily and peacefully (usually

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I studied nutrition and dietetics at the University of Minnesota. Although I am not a registered dietician, I do have a lot of training in this area. It always disturbs me when people point out how carefully you have to plan a vegetarian diet to ensure you are getting the proper nutrients, but don't think twice about the typical Western diet of high-calorie, low-nutrient, processed foods. Sure, a child who eats only mac and cheese and french fries (which would be DS's ideal diet) is going to have serious nutritional deficiencies, but adding chicken nuggets and hot dogs isn't going to help much. (I'm not trying to criticize anyone's comments, just generalizing from my own experience.) It is true, however, that if you are unfamiliar with a vegetarian diet, you may find it challenging to figure out what to eat. There are tons of great books and web sites that can help. It really is easy, once you know what's available.
I love our pediatrician. She recommended that we give DS a daily vitamin and every day, for dinner, insist that he try one small bite of everything that we are serving. Once he has tried everything, he may have a serving of whatever he wants that is on the table, but nothing made only for him. If he chooses not to eat, he doesn't eat again until the next meal (breakfast.) This may sound cruel (it did to us), but she assured us that children will not starve themselves. Once they figure out that you won't cater to their pickiness, they will start eating what is available. We were very reluctant, but tried it. At first, he refused. The next morning, he ate a large bowl of oatmeal made with milk, bananas, and peanut butter. (I know it sounds weird, but he loves it.) He gets to eat his preferred foods (mac and cheese) for lunch. The next few dinners, he reluctantly tried bites, and spit them out. Eventually, he actually started swallowing the food. Some nights, he still chooses not to eat, but those are few and far between. We've been doing this for a month and we've noticed a huge improvement, not only in his willingness to try new foods, but also in his overall behavior. He's not as stubborn as he was before.
Sorry to write such a long reply, but I hope this might help. BTW, it's very common for kids to not like meat, because of the texture.