...is making my life a misery 
Basically,he has an ongoing battle with his weight but doesn't seek advice,he is always in one of two phases,either overeating to extremes,this includes drinking vast amounts of lager or cutting right back to tiny amounts.
He has just failed a medical at work and has started the cutting right back phase,now me and kids are bearing the brunt of his withdrawal,short fuse,controlling behaviour,general not very nice to be around.
I have tried everything in the past,being supportive,offering advice re sensible diet,suggesting he seeks proffessional help,etc...and also just keeping quiet and letting him get on with it,my mum has chatted with him and his mum is a nurse and has given him lots of pointers.
Right now,i would prefer him to be fat and happy but he does need to lose weight as it is going to ruin not only his health but his job.
Any advice please?