My age is 24 and i am living in mumbai from last 2 year. When i was new here my memory was very sharp , i mean to say my boss use to tell me to remind me thinks next day and was capable of reminding him thinks very properly. But from last 6 months i am not able to remind this thinks him . my work is not profile or work load is not changed but still this issue i have. Is this due to improper diet or somthing else. I am not able to concentrate on my work as i was doing earlier. When i study i get tired very quickly like i have just ran a mile in 5 min. After taking an short break i fell good i can study again, but his waist my time and concentration to focus.