Fasting Under 18: Why It’s Generally Not Recommended
Intermittent fasting has gained popularity as a tool for weight management and metabolic health. However, fasting under 18 is generally not recommended. A ketogenic diet, which shifts the body’s metabolism to burning fat for fuel, can offer similar benefits without the risks associated with prolonged food restriction in young people.
The Risks of Fasting for Teenagers
During adolescence, the body requires a consistent supply of nutrients to support growth, development, and overall health. Restricting food intake through fasting can lead to several potential problems:
- Nutrient Deficiencies: Fasting can limit the intake of essential vitamins, minerals, and macronutrients necessary for healthy development. This can impair bone growth, immune function, and cognitive performance.
- Growth Impairment: Adequate nutrition is crucial for reaching full height and developing properly. Calorie restriction can stunt growth and delay puberty.
- Disordered Eating Patterns: Fasting may increase the risk of developing unhealthy eating behaviours and eating disorders, particularly in adolescents who are already vulnerable.
- Metabolic Disruption: Fasting can disrupt hormone balance and metabolic processes, potentially leading to insulin resistance and other health issues later in life. Learn more about the link between insulin resistance and keto.
A Safer Alternative: The Ketogenic Diet
The ketogenic diet, characterised by very low carbohydrate intake and moderate protein, allows the body to enter a state of ketosis, where it primarily uses fat for fuel. This can offer some of the same benefits as fasting, such as weight management and improved metabolic health, without the risks associated with prolonged food restriction.
Unlike fasting, a well-formulated ketogenic diet provides essential nutrients to support growth and development. It also promotes satiety, which can help prevent overeating and unhealthy snacking. It’s important to ensure the diet is balanced and includes a variety of nutrient-dense foods.
What This Means in Practice
Instead of fasting, teenagers can focus on making healthy food choices within a ketogenic framework. This might involve swapping sugary cereals for eggs and bacon at breakfast, choosing chicken and salad for lunch instead of a sandwich, and opting for a steak with green vegetables for dinner. A typical shop at Tesco might include eggs (£2.50 for a dozen), bacon (£3 for a pack), chicken breasts (£5 per kg), and plenty of leafy greens. This approach provides sustained energy and essential nutrients without the need for restrictive fasting.
Frequently Asked Questions
Is it ever okay for a teenager to fast?
In some cases, a doctor may recommend short-term fasting for specific medical reasons. However, this should always be done under strict medical supervision.
What are the best foods for a teenager on a ketogenic diet?
Focus on whole, unprocessed foods such as meat, poultry, fish, eggs, cheese, avocados, nuts, seeds, and non-starchy vegetables.
How can I ensure my teenager is getting enough nutrients on a ketogenic diet?
Work with a registered dietitian or nutritionist to create a balanced meal plan that meets your teenager’s individual needs.
What are the signs of an unhealthy relationship with food?
Signs include excessive dieting, preoccupation with weight, secretive eating, and feelings of guilt or shame around food. If you notice these signs, seek professional help.
The Bottom Line
Fasting under 18 carries potential risks to growth and development. A well-planned ketogenic diet can be a safer alternative, providing similar metabolic benefits without the dangers of prolonged food restriction. It’s crucial to prioritise nutrient-dense foods and work with a healthcare professional to ensure adequate nutrition. Learn more about the long-term safety of keto. If you’d rather not do the macro maths yourself, the automatic macro tracker in the Keto Dieting app does it for you on Google Play and the App Store.
References
- Paoli A, Rubini A, Volek JS, Grimaldi KA (2013). Beyond weight loss: a review of the therapeutic uses of very-low-carbohydrate (ketogenic) diets. European Journal of Clinical Nutrition. https://doi.org/10.1038/ejcn.2013.116
