Dietitian says a patient who followed an AI-generated 1400 kcal meal plan for three months lost muscle and developed chronic constipation, Gazeta.pl reports

The AI-generated plan. Gazeta.pl (kobieta.gazeta.pl, 5 October 2026) quotes a clinical dietitian on one of her patients, who came to her to reduce body fat and improve body composition. For the previous three months the patient had followed a meal plan generated by a tool based on artificial intelligence. The dietitian describes the plan as 1400 kcal and 140 g of protein a day at a body weight of 72 kg, about 2 g of protein per kilogram.

What the dietitian says was wrong with it. The protein amount itself was not the error, she says. The plan did not take the patient's lifestyle into account: her main activity was pilates two or three times a week and she did no strength training. At so low a calorie level, the very high protein was reached at the cost of carbohydrates, healthy fats and dietary fibre; the extremely low calorie level was, in her words, certainly not neutral for the hormonal system; and the plan's quality was low, with many processed protein products.

Consequences. After three months the patient had lost 3.5 kg, but body-composition analysis also showed a loss of muscle mass, which the dietitian says is what a reduction diet must avoid at all costs. The patient had also developed chronic constipation, which the dietitian attributes to a fibre intake of only about 9 g a day against a recommended 25 to 30 g.

Response. The dietitian proposed an 1800 kcal plan with 120 g of protein, whole grains, more vegetables, plant protein sources and adequate fibre, plus one or two strength sessions a week. She says this approach reduced body fat while preserving and gradually increasing muscle mass; no figures are given.

Limits. The account is the dietitian's, given in a feature on protein intake. The tool is not named, the generated plan is not reproduced, and the article does not say what the patient asked the tool or whether it was a chatbot or a diet application. The dates of the diet, the patient's age and the place are not stated. The muscle loss is not quantified.

In the dietitian's account, three months on the AI-generated meal plan left the patient with a loss of muscle mass shown by body-composition analysis and chronic constipation attributed to the plan's low fibre content.

The dietitian says she replaced the plan with a more balanced 1800 kcal diet with 120 g of protein, more whole grains, vegetables, plant protein and fibre, and one or two strength sessions a week. The dietitian says this approach allowed the patient to reduce body fat while preserving and gradually increasing muscle mass; the article gives no figures or timeframe for that result and no other follow-up.