How could obesity lead to high consumption of sugar? How can tooth decay lead to high consumption of sugar?

Please guide me through this. This is a project, so please try to give me much answers as possible.

How could obesity lead to high consumption of sugar? How can tooth decay lead to high consumption of sugar?
It is just the other way around. A diabetes researcher friend of mine said, though, : You can never eat so much carbohydrates that they would fatten you - namely, people usually eat also fat like in candy, cookies, cakes -not the sugar but the fat -and eating the sugar on top of it all!!





If you go and search you will find about 50 answers already in yahoo concerning sugar and obesity and a similar amount almost on tooth decay and sugar.Go and look at those answers first.They will take you far!
Reply:are you putting the cart in front of the horse?
Reply:everything you eat will turn to sugar somethings faster then others...... if you have an infection...like in your tooth.. your body's blood sugar will rise......sometimes thats how you know you have an infectioin is high blood sugar and you have good control of your diet.....you can find diabetic support classes in your town maybe call local hospital and they can point you in a right direction....