depends i guess why your skiiny,
myself im 5ft 10, the most i ever weighed was 9 and a half stone, the half stone i think was due to regular alchohol drinking at that time , when i stopped drinking i dropped to 9 stone, untill getting cancer and cheemo therepy now im just under 8 stone, im under a dietition and i use fortisip drinks on prescripion these are to help gain weight, fotified milk is also supposed to help, id be real happy to be 9 stone again,
iv heard guiness is good too
ps always eat breakfast then your not burning up your stored calories