Re: how can you control the glycogen metabolism in the liver?

These are very interesting questions.

My understanding is that hunger is only partially influenced by blood sugar per se and that hormones such as leptin and ghrelin also play a role in the hunger response.

Other than breaking muscle tissue down, converting it to the sugar glucose (via deamination and gluconeogenesis) and using that sugar to maintain glycogen levels, I am not sure that there is a way to maintain glycogen levels.

Even if this were possible (I'm not sure that it is) using a supplement or a drug, loss of muscle tissue would not be considered a positive outcome.

Since I believe that you are really asking how to stave off hunger and prevent weight gain, I would say that the best strategies would be:

1) to eat regularly (at least 3 times per day);
2) to consume a serving of protein at each meal (protein seems to be the most satiating of the macronutrients);
3) to consume a variety of low-glycemic index starches, fruits, and vegetables in order to help maintain blood sugar levels; and
4) to exercise regularly (using a combination of resistance and aerobic exercise) in order to increase metabolic rate.

References
glycemic index http://lpi.oregonstate.edu/infocenter/foods/grains/gigl.html

protein and satiety http://www.ajcn.org/cgi/content/full/82/1/1

gluconeogenesis http://web.indstate.edu/thcme/mwking/amino-acid-metabolism.html