6 of the survivors (jack, kate, sayid, hurley, aaron, and sun) eventually get rescued.
when they do, it's about 108 days after they first crashed.
so from season 1 to season 4 they've only been on the island for about 3 months.
in season 2 they find a hatch made by a team of scientists (the DHARMA Initiative).
inside the hatch is severl months supply of food.
then MORE food is dropped off from an undisclosed location on the island.
so there is always food on the island which is why Hurely doesn't appear to lose much weight.
also, YouTube the video LOST in 815 (8 minutes 15 seconds).
it'll give you a quick rundown on season 1-3.
then you can go to abc.com under season 5 of LOST and watch a recap episode titled Destiny Calls.
then you can start watching season 5 if you want.
you won't understand EVERYTHING that's going on (you'd have to watch every episode).
but season 5 is super good!
you and your bf should watch.