you are a lucky and wise man, in that you have begun to realize that some changes are in order to continue to live a relatively healthy life. the late forties are when i notice many people make some mistakes, namely not accepting that they are aging. I recall injuring myself about that age from trying to continue strenuous exercises that were more appropriate for people in their 20's. it is amazing how long you can remain fit by being prudent and yet appropriately active, if you are also somewhat lucky. with regard to diet, good healthy well made and well sourced food, is actually much more delicious than greasy kid stuff, although that may take a little adjustment period to realize. It also helps to be in close proximity with a good cook, or else you may want to become one. you might want to celebrate with a cooking class, or start a garden. fresh food is really good. at your young age, there is still time to do a lot, for which you are the envy of many of us. happy birthday!