Which intervention is the best evidence-based behavioral solution for an underweight person who reports poor appetite and early satiety?

Increase eating frequency with small, energy-dense snacks and add healthy fats to meals (e.g., nut butters, oils) while combining with resistance exercise to promote lean mass gain and improve appetite over time.

Advise the person to restrict fluids during meals to thin gastric contents and then attempt to consume a single very large meal each day, since extreme intermittent overeating is the most sustainable method to overcome satiety quickly.

Recommend avoidance of all exercise because any physical activity will further suppress appetite and therefore prevent weight gain regardless of its type or timing.

Instruct the person to rely solely on stimulant medications to increase metabolic rate so they will require more calories and therefore naturally increase intake without dietary planning.