There’s a 15 year-old boy in your house. He used to eat a whole box of cereal standing up at the counter. Now he weighs his chicken breast on a kitchen scale, calls rice “a cheat,” and says “macros” with the confidence of a man who still can’t find the laundry hamper.
Congratulations. Your son has been recruited by the Algorithm.
He says he’s “eating clean.” He’s “cutting.” He wants to look “shredded” for summer, or wrestling season, or for a TikTok audience that, let’s be honest, is mostly other 15 year olds who are also hungry. He learned all of this from a 26 year old influencer with perfect lighting, a supplement discount code, and a body built on genetics, filters, and possibly pharmaceuticals he doesn’t mention in the caption.
Here’s what he didn’t learn: he’s still growing. And right now, his growth plates are filing a formal complaint.
The Algorithm Is Not His Coach
This isn’t just your kid (or me) being dramatic. In a 2025 study of more than 1,500 boys and men, viewing muscle focused social media content was strongly linked to probable muscle dysmorphia. That’s the condition where a guy is convinced he’s too small no matter how big he actually is. The link held up regardless of total screen time. It’s not how long he scrolls. It’s what he’s watching.
And the platforms know what sells. One analysis of more than 2,200 #GymTok videos found that the content clinicians rated as more harmful got more views, likes, shares, and comments. So the app isn’t neutral. It’s a buffet that only serves the worst dish, and it keeps topping up his plate.
Puberty Is an Expensive Construction Project
Here’s the part the shirtless guy on the app skips. A teenage boy isn’t a small adult trying to drop body fat. He’s an active construction site. Boys usually hit their peak growth spurt around ages 13.8 to 14.1, and that spurt takes a lot of fuel. Male athletes in the 11 to 18 range can need about 2,500 to 3,000 calories a day. That’s before you add two-a-days, lifting, and a 40 minute walk to the car because he refuses to be dropped off at the front door.
Now imagine he’s burning that and eating like a 50 year old accountant on a cleanse. The body does what any smart business does in a budget crisis: it cuts the non-essential departments. Unfortunately, “non-essential” includes growing taller, building bone, and making testosterone.
There’s a name for this: Relative Energy Deficiency in Sport, or RED-S. For years people talked about it like it only happened to girls. Wrong. According to the American Academy of Pediatrics, RED-S can affect any athlete regardless of gender. Low energy availability drops hormones like testosterone, which can weaken bones, raise stress-fracture risk, and slow growth.
So the irony is impressive. He’s starving himself to look more masculine, and his body answers by turning down the hormone that makes him more masculine. Nobody puts that in the caption.
“Cutting Weight” Is Not a Personality
Then there’s the weight class crowd: wrestlers, boxers, rowers, and the occasional football player who thinks he needs to be “lean” for a sport where people literally run into each other on purpose. Spitting in a cup, running in a trash bag, skipping water, sitting in a sauna. It’s not dedication. It’s a dehydration speedrun.
The AAP warns that ongoing unhealthy weight loss methods can lead to delayed physical maturation and impaired growth, along with lower strength, slower reaction time, and stress on the heart, kidneys, and hormone systems. The National Federation of State High School Associations notes that dehydration beyond 3 to 5 percent cuts strength and endurance and in extreme cases can lead to heat stroke, muscle breakdown, kidney failure, and cardiac arrest.
So he cuts weight to gain an edge and shows up weaker, slower, foggier, and crankier. Truly elite strategy.
This isn’t rare, either. The AAP has reported that 10 to 15 percent of high school boys in weight sensitive sports use unhealthy weight loss behaviors. If weight loss is ever actually needed, the guidance is slow and boring: no more than 1 to 2 pounds a week. Boring is underrated. Boring doesn’t land you in the ER.
The Bones Are Keeping Score
Adolescence is the bone banking window. What he deposits now is what he lives on for the rest of his life. In a 3 year study of elite male high school athletes, more than a third had poor spine bone health, and most lost or failed to gain the bone expected during puberty, even while their performance improved. Read that again. He can look great and play well while his skeleton quietly underperforms.
What Parents Should Watch For
You don’t need a lab coat. You need eyes and a little nosiness.
Food rules multiplying. Whole food groups dropped, panic about carbs, meals skipped “because I’m cutting.”
Height stalling. If the growth chart flattens while his friends keep shooting up, that’s worth a visit.
Puberty running late, or progress that seems to stop.
Stress fractures, repeat injuries, or constant fatigue.
Mood changes. Irritability, anxiety around food, or skipping social events that involve eating.
Compulsive exercise, including extra workouts after practice or getting upset when one is missed.
Supplement creep. Protein tubs turn into fat burners, then into “stuff a guy at the gym recommended.”
What Actually Works
Feed the kid. Seriously. Three real meals and real snacks, including carbohydrates, which are not a moral failing. They’re fuel. Get him to a pediatrician who will plot his growth, check puberty, and ask the awkward questions. If he wants to get stronger, a qualified strength coach and a sports dietitian beat a 30 second video every time. And talk about the content he’s watching: who’s selling what, whose body is real, and why the guy with the abs also has a promo code.
The goal is a teenager who grows into his full height, his full strength, and a healthy relationship with food. A six pack at 15 means nothing if it costs him two inches, a stress fracture, and a decade of fighting with his dinner plate.
He has the rest of his life to look like a magazine cover. Right now, his only job is to grow.
This article is for educational purposes only and is not a substitute for individualized medical advice. If you’re worried about your child’s eating, growth, or health, talk with your pediatrician.