Episode 213: Is Underfueling Behind Your Gymnast’s Mood Swings?

So much of the anxiety, irritability, meltdowns, and attitude we see from preteen and teen gymnasts gets chalked up to “teenage hormones” or being a moody teenager. And yes, puberty is messy brains are developing, school is harder, friendships are more complicated, and gymnastics only gets more demanding as the levels advance.

But what most parents and coaches don’t realize is that a lot of that mood and emotion regulation trouble has a lot more to do with an underfueled brain than it does with normal teenage angst.

The brain only makes up about 2% of body weight, but it uses 20% of your gymnast’s resting energy expenditure and it needs at least 130 grams of carbohydrate a day just to function, before factoring in a full school day and hours of training. When a gymnast is running on empty by 7:30pm after a long day, her brain isn’t being “mental” or uncoachable when she falls apart after a correction it’s simply out of fuel and in panic mode.

Christina breaks down the science behind why underfueling hits the brain just as hard as it hits bones and muscles: the hypothalamus constantly senses whether there’s enough energy coming in, and when there isn’t, it signals the reproductive system (lost periods), thyroid (metabolism), and adrenal glands (stress response) to pull back. Add in the fact that neurotransmitters like serotonin and dopamine are literally built from protein, carbohydrate, iron, B vitamins, copper, and vitamin C, and it’s easy to see how an underfueled gymnast ends up stuck in a cycle of fatigue, frustration, mental blocks, and anxiety that gets labeled as a confidence or mindset problem when the real issue is that her brain and body simply don’t have enough resources to cope.

Christina also walks through why “but she eats a lot” often isn’t the full picture, especially for gymnasts who’ve been underfueled for years and are now working against a cumulative deficit which is why many of the gymnasts she works with need 2,500 to 3,000+ calories a day to actually catch up.

In this episode, we cover:

❗ Why mood swings, anxiety, and meltdowns in teen gymnasts are often blamed on hormones when fueling is the real driver 
❗ Why the brain needs at least 130g of carbs a day just to function — before school and training 
❗ How the hypothalamus links underfueling to lost periods, stress fractures, and always feeling cold 
❗ Why serotonin and dopamine can’t be made without enough protein, carbs, and key micronutrients 
❗ How the “underfueled → tired → frustrated → labeled mental” cycle leads gymnasts to quit 
❗ Why headaches, stomach aches, and delayed puberty often get investigated by specialists without anyone ruling out underfueling first

If your gymnast doesn’t seem like herself anymore and you want to make sure underfueling isn’t behind it, reach out. Information on how to connect is below.

Links & Resources
The Balanced Gymnast® Program (Level 5–10)
Connect with Christina on Instagram @the.gymnast.nutritionist
Episode 138: Gymnast Labs, Endurance, and Iron Deficiency/Anemia
Episode 188: Gymnast Mental Blocks and Nutrition