Preteen growth spurt: why they're always hungry

Why your preteen is suddenly always hungry

If your 10- or 11-year-old is hungry again an hour after dinner, the most likely reason is that they’re getting ready to grow. The American Academy of Pediatrics says a surge in appetite around age 10 in girls and 12 in boys foreshadows the growth spurt of puberty — and that the body demands more calories in early adolescence than at any other time of life.⁴

In real food, that can look like a second breakfast, a full sandwich after school instead of a handful of crackers, and a snack before bed. That’s normal. A child’s need for calories rises during times of rapid growth.⁵

When the growth spurt happens

Puberty is when children grow taller faster than at any other time in childhood.¹ About 25% of a person’s growth in height happens during these years.⁵

Before puberty, children grow about 2 inches a year. During puberty that rate roughly doubles — a boy may grow 4 inches in 12 months.¹ Girls often gain about 3 inches in the 6 to 12 months before their first period.¹

Girls usually begin puberty between 8 and 13, and grow fastest between the start of breast development and about 6 months before their first period, which arrives on average around age 12. After the first period growth slows, and most girls grow only another 1 to 2 inches.² That’s why the hungriest stretch often comes before periods start.

Boys usually start between 9 and 14, and their growth spurt typically begins about a year after puberty’s first changes — generally by age 15.³ This is why, for a while, 13-year-old girls can be a head taller than boys the same age.¹

Weight goes up too, and that’s expected: the AAP notes it’s normal to gain weight while growing taller in puberty, and girls naturally gain some body fat.² The AAP says the overall pattern of weight gain on the growth chart matters more than any particular number.²

A preteen eating everything in sight is usually a preteen who’s about to need new shoes.

Always hungry after dinner or before bed

Late-evening hunger is one of the most common things parents notice. Rather than refusing food, plan for it:

• Build in an evening snack. The AAP suggests three meals and two or three snacks a day for children, spaced so snacks don’t spoil meals — at least 2 hours before.⁶ For a growing preteen, one of those snacks may simply come after dinner.
• Serve enough at dinner. If they’re hungry again within an hour, add more of the filling parts — protein foods, whole grains, beans.
• Keep a “help yourself” shelf. Yogurt, cheese, eggs, fruit and whole-grain bread let them refuel without negotiation.

Preteens eat a lot of their food away from you now — school lunch, friends’ houses, after-practice snacks. Having good options at home matters more than policing what happens elsewhere. For a sense of how much is typical at this age, see how many calories a 10-year-old needs.

Snacks that actually fill them up

The AAP says snacks that combine a carbohydrate with some protein — like crackers with peanut butter — are the most energy-efficient.⁷ It also suggests half sandwiches on whole-grain bread, fruit, dried fruit and nuts, and hard-boiled eggs.⁷ Protein figures below are from USDA FoodData Central.¹¹

Greek yogurt + fruit6 oz yogurt

≈ 17 g protein

Hard-boiled eggs2 large

≈ 12.5 g protein

🥪

Half sandwich, peanut butter2 tbsp peanut butter

≈ 7 g + bread

🧀

Cheese + crackers1 oz cheddar

≈ 6.5 g protein

🥛

Glass of milk1 cup

≈ 8 g protein

Photos: Karly Gomez, Eaters Collective / Unsplash

Notice what’s missing: chips and sweets on their own disappear fast and leave a growing kid hungry again soon. Energy drinks aren’t a snack either — see energy drinks and kids. For how protein adds up across the day, see how much protein a 10-year-old needs.

Don’t let breakfast slide

Breakfast tends to drop off just as needs go up. The AAP reports that 13% of school-aged children skip breakfast, rising to more than 27% of adolescents aged 12 to 19 — and girls start skipping earlier than boys. Some kids skip it in an attempt to avoid weight gain; others are simply too sleepy.⁸

Any breakfast beats none. The AAP’s ideas include last night’s leftovers, peanut butter on a tortilla or apple slices, a milk-and-fruit smoothie, and eggs boiled the night before.⁸

Iron for girls starting their periods

Children aged 9 to 13 need 8 mg of iron a day. At 14 to 18, that rises to 15 mg for girls, compared with 11 mg for boys.⁹ The 2025–2030 Dietary Guidelines note that adolescence brings increased iron needs, especially for girls because of menstruation,¹⁰ and the NIH lists teen girls with heavy periods among the groups most likely to run short.⁹

Good sources include lean meat, seafood and poultry, iron-fortified cereals, and beans and lentils.⁹ A 3 oz beef patty has about 2.2 mg and half a cup of cooked lentils about 3.3 mg.¹¹ Eating plant sources of iron with meat or vitamin C foods — citrus, strawberries, peppers, tomatoes — helps the body absorb it.⁹ Tiredness, weakness and trouble concentrating can be signs of iron deficiency anemia.⁹

When hunger is a sign of something else

Rarely, constant hunger is a symptom rather than a growth spurt. Type 1 diabetes can start at any age, but it peaks around ages 5 to 6 and again at 11 to 13. The AAP lists its key signs as peeing more often (especially at night), being very thirsty and tired, losing weight, and an increased appetite.¹² High blood sugar and dehydration from untreated diabetes are dangerous, so these signs need a call to your pediatrician the same day.¹² If your child is also vomiting, breathing fast or deeply, or is very drowsy or confused, go to the emergency room or call 911.

Hunger that comes with eating very large amounts quickly, eating in secret, or feeling ashamed afterward can be a sign of binge-eating disorder and is worth raising with your child’s doctor.¹³

When to talk to your pediatrician

These signs come from the AAP, the NIH and the National Institute of Mental Health.^1291323 Otherwise, a ravenous preteen is usually a healthy one: keep good food within reach and let them eat.

Common questions