Hi Thanks for posting your query .I have gone through your details.According to my opinion proper medical history of patient is extremely important for a correct diagnosis.Get his
thyroid profile check and also ask if he have any dental problem.Meanwhile here I am suggesting effective remedies for gaining weight and also for increasing energy and stamina.Have 1 tbsp chyavanprash daily in the morning.
Soak 10 almonds and 10 raisins overnight and consume in the morning.
Have banana or banana with a glass of milk twice daily.
Boil milk with almonds,dates and drink.
Take 1 tbsp
ashwagandha root powder and 1 tbsp shatavari powder with milk daily twice.
Take a light nap after a noon meal.
Boost up your appetite by walking daily for 20 minutes.
Practise effective asanas for boosting energy and gaining weight
Sarvangasan,bhujangasan,shavasan,
yoga nidra.
Stay away from
stress.
Few herbal medicines are effective like chyavanprash,kushmanda avaleha,shatavari
kappa,ashwagandha avaleha.
Hope this answer is useful to you.
Take care.
Dr.Pallavi