I was recently approached by a colleague to answer questions for a journalist looking into teen male trends in dieting and exercise. I thought I’d share my thoughts with you.

As a side note — alongside my work in the fitness space, I also work as a consultant dietitian in the eating disorder space. What follows is both experience and evidence-based. I hope it helps.

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What’s the Ideal Diet for Teenage Boys and Young Men (Ages 14–24)?

With such a broad age bracket, providing a specific “ideal” is challenging. What we actually do is assess four key areas:

• Body measurements — weight, height or body composition
• Biochemistry — what the blood is telling us
• Clinical context — diagnosis, medications, allergies, intolerances and bowel habits
• Current intake and environment — work, school, living situation, activity levels and timing

As a teenager, we’re still expecting height growth — so adequate nourishment throughout the day is essential on top of basal metabolic rate and activity. Cereals and grains make up the most significant energy contribution. Appetite, thirst and perceived exertion are often the best intuitive signals of whether a meal is adequate for that time of day and activity.

This is why most of us as dietitians are reluctant to say — “this is a one-size-fits-all meal plan.”

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Teenage Boys, Weightlifting and Rigid Diets

Weightlifting in the right environment can be a genuine confidence-builder for young men and women. Progress, strength and consistency — done well, it’s a powerful pursuit.

The problem starts when the aesthetic goal supersedes the performance goal.

The classic rice, chicken and broccoli cycle isn’t random — the body can only metabolise 20–30g of protein at a time. But when one meal dominates:

• Broccoli as the only vegetable — misses the vitamins and minerals other vegetables provide
• Rice as the only carbohydrate — misses the impact of different fibre types on the microbiome
• Protein-heavy bias — time and time again, liberalising carbohydrates improves individual output: growth, performance and recovery. Carbohydrate is our best fuel source. You will lift better, deliver more stimulus to the muscle and get stronger faster with it.

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Calorie and Macro Counting

Calorie counting turns what is inherently a normal human behaviour — satisfying hunger — into a calculation.

For some, it presents no issues. For others, it becomes a pass/fail. The daily grind of hitting numbers, combined with rhetoric like “you need to eat to beat the old you,” becomes a constant battle with food and body.

In its most extreme form, I have worked with young men who place such pressure on themselves to get “the calories in” that they experience reflux as they attempt to eat.

This is a grey area. We applaud discipline and sacrifice — and as a body “transforms,” the positive reinforcement keeps coming. But that transformation is often never enough mentally. Worth becomes tied to external validation. More restriction or consumption follows. Social isolation increases. The body starts responding negatively — injuries, frustration, plateau. A vicious cycle of “not enough.”

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Fast Food and Convenience Eating

Context matters here.

If a takeaway meal is consumed as part of a normal diet — in a social setting, as part of a celebration or school event — that’s completely normal and okay.

If it’s consumed purely “to get calories,” we’re filling up on saturated fat, high salt and high sugar foods that are low quality in terms of their impact on gaining strength.

As health professionals, we look at every eating occasion as an opportunity to proactively invest in an individual’s health. When we react — out of convenience or poor preparation — that’s an opportunity missed.

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When Teenage Boys Start Cooking Their Own Meals

This is a tricky situation for parents.

The 14-year-old craving independence and showing interest in their health is a positive sign — but suddenly “too good to eat with us” is a red flag.

Research from as young as 2–3 years old supports that families dining together leads to better health outcomes for everyone. When a client shows distress around sharing the eating experience with their family, that’s something we take seriously.

My question in sessions is always: why? Why can’t your meal be shared with the family? Why couldn’t you cook for others if you’re cooking for yourself?

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The GOMAD Strategy (A Gallon of Milk a Day)

This one’s interesting. In my undergraduate years I actually researched this specific diet.

The influencer who popularised it used aggressive language around the common symptoms — diarrhoea, reflux, acne, bloating — calling people’s concerns “excuses” and telling them to “suck it up.”

I’ve been in fitness for nearly 15 years and helped hundreds of people become the strongest they’ve ever been — deadlifting beyond double their body weight, squatting 1.5 times their body weight, benching beyond expectation.

To powerlift correctly, you cannot be fighting bloating, dealing with reflux or deadlifting heavy with diarrhoea lingering. When your body communicates symptoms like these, something you’re doing, consuming or thinking is not aligned with your health.

You don’t have to have negative health outcomes to get strong. It’s the opposite. With a focus on enjoying the performance element and patience in the process, we build the consistency required to keep progressing.

Yours in Health and Strength
Sean Cornish