Transcript for Could Picky Eating in Children Be Something Serious?
so tweet her @dryashton. I the "Heat index" to kids who are picky eaters. Near hi every family has at least one. Can it be a sign of something more serious. A brand-new study may reveal it may be and ABC's Mara schiavocampo has more. Reporter: For many parents getting their kids to eat isn't just a food fight it's an all-out war. I have a 21/2-year-old who -- I have no idea how he's alive. All he eats is white bread, ketchup and milk. Reporter: Even celeb mom Reese Witherspoon whose instagram is filled with ways to entire her son, mom Jennifer Nicholson says her 4-year-old Liam is the same way pretty much sticking to hot dogs, chicken nuggets and peanut butter. Broccoli is the only veggie he eats and no fruit. A lot of ways my friends do it is mix something in a smoothie but he won't eat a smooth smoothie. Reporter: Liam may be average or a little selective with his diet but according to a new study published in the journal "Pediatrics" severe picky eaters were more likely to show anxiety, social anxiety a depression. Had hyper sensitive to texture and taste and a lot of conflict in the home around food. Reporter: The study found selective eating in younger years may even predict psychological issues later on. We don't know that picky eating causes psychiatric symptoms and we want to be careful not to overstate that connection. But I think it's a good first initial study. Reporter: So what can you do to get your picky eater to open wide? It's important to have fun with it. You can add attractive straws to a smoothie, you can always shape the fruits adding some spices, it's all going to be part of that positive experience. Reporter: For "Good morning America," Mara schiavocampo, ABC news, New York. Let's build on that. Let's get more tips. Candace Cameron Bure, we'll talk about your book "Dancing through life" and you have three teenagers. Uh-huh. Any of them picky eaters before. I had one that was a picky eater but we're real foodies so we change the food all the time and the rule at our table was you have to try it once, one bite, swallow it. If you don't like it, that's fine but I'm not making you anything else so you can have breakfast, if you don't like dinner. You got to stick to that? That's exactly the rule in our house too, as well. It was when I was growing up so we've got this recent study. Four different picky eater personalities. Here's what they are sensory dependent eater. Dislike unusual textures and smells. Preferential eaters reject the unfamiliar. Then behavioral responders need food exactly how they like it and then general perfectionists have a variety of idiosyncrasies, does this ring a bell for anyone? The last one, the food can't touch on the plate. I have one that does that too. Separates them all. No mixing. You'll get there, Dan. Yeah, I know. I'm interested in the other end of the spectrum. Our 7-month-old, he would eat sweatsocks if you gave them to him. I have that too. A healthy appetite. Very healthy. He's a big boy. He is a -- we think he is around 25, 26 pounds at 7 months so he's a big boy and he's not getting it from me, ladies and gentlemen. On the list of things shorter than a Rousey fight, me.
This transcript has been automatically generated and may not be 100% accurate.