How To Teach Kids What "Good for You" Really Means

We’ve all said it to our kids—often pleadingly across the dinner table—that simple four-word phrase: “It’s good for you.” But what does that actually mean? And how can we help our kids understand and value the answer?

So, what does “good for you” mean? 

“‘Good for you’ does not mean low-calorie,” says Kacie Barnes, MCN, RDN, LD, “even though that’s what many of us learned when we were younger.” Calories are simply energy—and growing kids need enough of them.

A more helpful way to think about food is nutrient density: how many vitamins, minerals, fiber, protein, and fats a food provides relative to its calories.

“Some foods are like stuffed suitcases,” Barnes explains. They’re “packed full of nutrients that are delivered to the body.” This includes foods like avocados, pumpkin seeds, and plain yogurt. “Others are more like nearly empty suitcases with not much inside,” meaning they offer fewer nutrients for the same calories, such as white bread, cookies, and candy.

What about “healthy” food?  

“When I think of a healthy diet as a dietitian,” Barnes says, “I’m thinking of a diet that contains many nutrient-dense foods and fewer low-nutrient-dense foods.” Those “stuffed suitcase” foods include fruits and vegetables, lean proteins, dairy, whole grains, nuts and seeds, and oils like olive or avocado oil.

Kids can eat healthily in many different ways, she adds. “Your child can eat healthy overall even if they don’t eat meat, don’t eat many vegetables, or have food allergies that limit certain foods.” In other words, there’s no one-size-fits-all approach to healthy eating.

Dietitians often reference the Dietary Guidelines for Americans (DGA), released every five years by the USDA and HHS. Barnes also notes that while protein gets a lot of attention, true protein deficiency among kids in the U.S. is rare. More common? Lower intake of nutrients like fiber and potassium, found primarily in fruits and vegetables.

How To Tell if a Food Is Nourishing

Nutrient density is a strong starting point. Barnes suggests prioritizing foods that provide vitamins, minerals, and fiber while being mindful of excessive added sugars.

“How the food makes your child feel matters,” she adds. Ideally, food should provide steady energy, not a quick spike followed by a crash. That crash often happens when sugary or refined carbohydrate foods aren’t balanced with protein or fat. 

Nourishment isn’t only physical. Emotional satisfaction matters, too. “You can emphasize nutrient density and still leave room for foods that bring joy,” Barnes says. A healthy diet can and should include fun foods and treats, too.

What ingredients matter most? 

Start with what the food provides. Fruits, vegetables, whole grains, beans, nuts, seeds, and quality proteins supply essential vitamins, minerals, fiber, and protein. “Those are the building blocks growing kids actually need,” says Barnes.

Added sugars deserve some scrutiny, though. “We have solid research showing that high intakes of added sugars aren’t beneficial for kids’ health and can crowd out more nutrient-rich foods,” she says. That doesn’t mean sugar is off-limits—it simply calls for moderation. 

Speaking of additives... Preservatives are often misunderstood. “They actually play a positive role in our food system,” Barnes explains. Preservatives help keep food safe, reduce food waste, and increase access to nutritious foods when fresh options aren’t available. She adds that preservatives used in the U.S. food supply are considered safe in small amounts based on current research.

Explaining “Good for You” to Kids 

How we talk to kids about food matters. Barnes encourages conversations that are empowering, not restrictive. 

“Kids can easily hear ‘this food is bad’ and translate that into ‘I’m bad for liking or eating it,’” she says. Instead, connect food choices to what kids care about: running fast, thinking clearly, growing strong, and feeling good. 

You can explain what foods do for the body: some help muscles, some help brains, some help us poop. And some foods are just for fun—and that’s okay, too. 

Food Messages to Un-Learn 

Previous generations did their best, Barnes says, but many food messages we grew up with can undermine a healthy relationship with food: 

“You have to clean your plate.” 
Instead, help kids tune into their hunger and fullness cues. 

“Eat your vegetables to earn dessert.” 
This puts sweets on a pedestal and turns vegetables into a chore. Kids don’t need to earn food.

“A moment on the lips, a lifetime on the hips.” 
This phrase promotes body shame. “How your child feels is far more important than how their body looks,” Barnes reminds us.

Positive Phrases Swaps

Teaching kids what “good-for-you” really means isn’t about rules or perfection. It’s about helping them understand how food supports their bodies and energy—while keeping mealtime positive, flexible, and free from shame.

FAQ

What does “good for you” actually mean? 
It means nutrient dense. Foods that deliver more vitamins, minerals, fiber, protein, and fat best support kids’ growth and well-being. 

How should I explain “good-for-you” foods to my child? 
Talk about what foods do for their body. How they help them have energy, grow strong, think clearly, and feel good. Avoid labeling foods as “good” or “bad.” 

If a food has sugar, can it still be “good for you”? 
Yes. Foods with naturally occurring sugar, like fruit and dairy, also provide important nutrients. What matters most is the overall nutrient value. 

Do ingredients matter when deciding if a food is “good for you”? 
Yes, but more for what they add than what they avoid. Nutrient-dense ingredients support growth, while added sugars deserve moderation. Preservatives can play a safe, practical role. 

Do kids need to eat perfectly to be healthy? 
No. Health is built over time, not from any single meal or snack.