**This meal plan is dangerously inadequate for a 15-year-old male athlete.** A peer-reviewed study published in *Frontiers in Nutrition* (March 2026) by researchers at Istanbul Atlas University systematically compared AI-generated adolescent diet plans against those created by registered dietitians. The findings were alarming: **Systematic undercalculation:** AI models underestimated energy by an average bias of **+695 kcal**, protein by **+19.9g**, lipids by **+15.8g**, and carbohydrates by **+114.6g** — meaning the AI plans were missing these amounts relative to what a dietitian would prescribe for the same adolescent profile. **Macronutrient ratios all wrong:** All five AI models tested (ChatGPT-4o, Gemini 2.5 Pro, Claude 4.1, Bing Chat-5GPT, and Perplexity) produced protein ratios of 21.5–23.7% and fat ratios of 41.5–44.5% — both well above adolescent guidelines. Carbohydrate ratios of 32.4–36.3% were significantly below recommended levels. A growing teenage athlete needs carbohydrates for energy, not 44% fat. **No model was consistently reliable:** Across all nutrients tested, not a single AI model showed consistent proximity to the dietitian reference. Different models were wrong on different nutrients in different ways — there was no pattern a parent could use to "adjust" the AI's output. The study's conclusion was unequivocal: **"AI-based dietary recommendations are not appropriate to use without professional supervision."** For adolescents in their growth and development period, following AI-generated meal plans could result in clinically significant nutritional deficiencies. Grok's specific plan (~1,600 calories for a teenage athlete) exemplifies the problem: it's 600-800 calories short of what an active 15-year-old male typically needs, and the macronutrient balance is upside-down.