I feel it's a psychological one. Whenever we are in stress or anxiety we don't enjoy the food that we eat and also there is no hunger. All these results in improper digestion and thus proper assimilation of nutrients into the body isn't there. Consult me personally on call. I can just counsel u and guide u for proper diet and how to over come anxiety issues. Brain and gut health is interrelated. Emotions over power our hunger and only when we are happy your digestive system acts well. Nothing to worry about.
Health Tips
Practice mindful eating habits.
Practice abdominal breathing thrice a day for 5mins before food.
10 mins of meditation everyday.
Eat healthy home cooked food avoid junk.
And it's nothing to worry if u aren't gaining weight. But it will be issue of worries when u lose weight.
Drink a glass of milk, take curds, include paneer in your diet, an egg each day, 2 bananas everyday.