I would tell him that, "Even a weight loss of 10% can make a noticeable improvement in the problems you mention."
Obesity is defined as the health conditions that arise when an individual has a Body Mass Index(BMI) that is equal to or greater than 30.
Mr. Curtiss has Obesity because his BMI is 43.
He may likely experience the following symptoms;
Therefore, in order not to make him feel depressed, I would rather encourage him that even a weight loss of 10% can make a noticeable improvement in the problems you mention.
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