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The nagging pain he must be going through will depress anyone enough to the point of giving up; on everything -- doctor included.
If he suffers from multiple spinal compression fractures, a shorter spine can compress the stomach, causing a bulging stomach and digestive problems like constipation, less appetite, and weight loss. So it's understandable his energy is low and he feels tired all the time.
If he seems too tired to chew, try feeding him cups of thick broths. And when he looks perkier than usual, try snacks packed with calories (e.g., small crackers with roasted peanut butter). Don't forget the multi-vitamins.
Wish you the best.