Well to get your abilitiy back you have made the first step by coming back here.
Desire is key, never forget that.
That depends on how much you have reduced your intake on food, and what foods you are now not eating. As you may be aware, there are sections on this forum that talk about food intake and lucidity, ie what foods and vits are good for dream recall and lucid dreaming. But I would guess that 1. you are eating a normal amount? in other words your not killing your self
2. your are probally intaking a normal range of vits and therefore this is probally not a cause
In sum i would suggest that in general eating less will not greatly effect your dreams, infact, eating less, or over eating, will actual keep you ina lighter sleep ergo better dream recall… not something i suggest
It is true that as you age you spend less time in REM, but the other side of the coin is this, as you age you learn a lot more and have more control over your body (to an extent) use your knowledge to your advantage, so lets say you dream 5 times a night not 6, if you are more experienced wouldnt it be better to be lucid in 4 out of 5 then 1 out of 6?
Simply no this shouldnt reduce your effects at your age
If a lot of your lucid dreams involved games, maybe. Games are a great way to focus parts of your mind, and also incorp into your dreams. By dreaming of games you are more likely to notice that it is not reality and enter a lucid dream. I say more likely not it will happen.
This, if anything, should stimulate the amount of dreams you are having, and you can use this to your advantage too. think about it like this, you are dreaming of being at your old home old country, snap reality check and there you are inside a dream.
By being a new place you are more then likely to dream about your old enviroment and incorp your new material, ie a new friend who you are dreaming about in your old high shcool. Make sense? Use your dream signs.
I suggest the following:
focus on dream recall - how much do you recall? aim at 2 a night
focus on reality checks
focus on dream signs
Vis lucid dreaming all the time
remember why you first wanted to get into lucid dreaming
be passionate about lucid dreaming.
Do all of the above and i would say that you would increase your chances of getting back into lucid dreaming, at a much higer rate then once a week, but at least 60%
In other words, think about it a lot more, dealve into learning different techs and have fun and you will be lucid dreaming all the time.
Have fun, let me know how you go
Rich