Which BMI range indicates that John is on the "warning track" for weight control?

The BMI range that indicates John is on the "warning track" for weight control is between 25 and 30. This range corresponds to the classification of overweight, which serves as a cautionary indicator for potential health risks associated with weight. Individuals within this BMI category may not be obese, but they are at an increased risk for developing health complications such as cardiovascular diseases, type 2 diabetes, and hypertension if lifestyle changes are not made.

Monitoring weight at this stage becomes critical as it implies that while John is not yet in a severely problematic category, he is still advised to adopt healthier habits to prevent further weight gain that could lead him into the obesity range. Understanding his BMI and its implications allows for proactive management of weight and associated health risks.

The other BMI ranges provided suggest either lower weight categories or higher obesity classifications, which do not capture the "warning track" concept intended for individuals who are beginning to face challenges related to their weight management.