I used to drink lots of Pepsi. I switched to water and the very occasional 7UP or ginger ale. I switched from sausage and eggs to oatmeal for breakfast too. I have what could be called "a little weight problem", cholesterol too. the weight and cholesterol are both slowly dropping.
Depends on the concentration. Up to about 5% alcohol in a beverage isn't that bad. It should not hurt any intact body tissue and it will not dehydrate you. A classic soda otoh usually contain s a lot of crystal sugar (though not more calories than beer) and acidic components, both will definitely hurt your teeth. The long term and especially the combination effects of classic additives (aromas, colorants) are not exactly thoroughly researched. Drinking that stuff in large amounts kind of makes you a lab rat.
I have a friend who "doesn't want to put chemicals in her body", but she drinks heavily. You're literally poisoning your body! Do it up, but don't preach to me about a healthy life style.
I think it's actually helping