I'm from the U.S. 56 years old. I've always struggled with weight. I several weeks at a time in BA over the past 5 years and always found that weight just melted off while I was here. Since I spent about 6 weeks here in November of 2009 and lost about 15 pounds. Gained about 7 to 10 back when I returned to the U.S. Then came back to BA in March of 2010 and lost 35 lbs in 3 1/2 months. Had to head back to the U.S. to handle some business and gained 10 lbs back during the 6 month stay in the U.S.
I'm now back here and my ability to lose and/or maintain weight is one of the primary reasons I now live here. (It used to be that the low cost of living was also right at the top of the list but that is fading fast.)
I attribute my weight loss in BA to:
1. Slightly different daily schedule. Because of the 3 hour time difference between Dallas time I am never tempted to eat breakfast here (and wouldn't know where to do it if I was tempted, other than McDonalds). Let's face it, 2 eggs, 2 pieces of toast (or bisquits and gravy), bacon or sausage, and glass of sweet orange juice is not exactly a low-carb meal.
2. I think I walk more here than I actually realized. I took a walk (from Las Heras and Junin in Recoleta) to buy a transformer at Corrietes and Parana (about 12 blocks). Walking there and back was about 1 hour of walking. I went to the gym every day in the U.S. doing 45 minutes of aerobics. But I would never walk an hour in the U.S. living in the suburbs. Longest walk most Americans take is to their garage from their kitchen.
3. I eat smaller portions here. Chili's etc really provide us about twice the amount of food we need in a meal, now don't they?
4. Keeping carbs down is easy here. You can buy a decent steak and sweet potato (low GI) for $10 which is hard to do in the U.S. Perfect for a carnivor like me.
At any rate, my goal is to lose another 25 lbs over the next 4 to 5 months to get to my "fighting" weight. It will be first time I've been there (180 lbs) in three decades. I was a frightening 250 lbs a year and a half ago.
As far as the Argentinos ... They will need to learn to close down all these pizza joints and only go to Freddo's for a single dip once a week. Also, quit serving french fries with every meal ... My god, the fancy restaurants serve french fries here. It's crazy.