The weddings may be fat, but the brides certainly are not, and on Sunday night's episode of "My Big Fat American Gypsy Wedding" (Sun., 10 p.m. ET on TLC) viewers picked up some handy weight loss tips.How do the girls stay so slim? It turned out that just like their romany cousins across the pond, these romanichal gypsy girls eat a lot of malt vinegar and salt.