I got back from a 6-day Universal/WDW vacation about two weeks ago. I came back and my scale said I was about 6 pounds over what I left as, but within the next 2-3 days it went down (I eat healthy at home and decently at WDW, but I'm sure all that excess salt was keeping some bloat) and within the next week I was back towards weight loss. However, this was actually a super pleasant surprise because about a week prior to going I just turned 21, so you can bet that I was indulging in that.
Some weight tips:
If you drink coffee, buy coffee/a cheap coffee pot from
Walmart (they have cheap pots for around $8-$9) and your own coffee creamer, sugar, etc. The mocha iced coffees at WDW kill me, but I need one coffee each morning (and maybe another back at the hotel for a mid-day break). By making my own coffee, I can decide just how much I put in it (fyi. I use 2 tbsp of coffee creamer which is about 70 cals and then stevia for the sweetener). All of those coffees at WDW will add up, so this is an easy place to cut back.
I also had some snacks at the hotel, so I rarely ate any snacks at the park. I would have low cal cheese sticks, trail mix, and low cal/low fat chips at the hotel that I would have when I went back for a break in the day. Again, cheaper and healthier than a Mickey ice-cream or popcorn (though I definitely did enjoy a Disney cookie and some kettle corn...everything in moderation!)
At the parks I would just attempt to make good choices. I didn't eat a single hamburger during that trip and I tend to stay away from fries for the most part. Also there are some meals that are actually real big and can be split, or you can at least mix and match. For example, I got a greek salad at Cosmic Rays while my mom got the chicken and ribs combo, and we just split everything. We love trying everything we can, so if we would pick 2 menu items that interested us and just split it (but NOT at flame tree BBQ...I need those chicken and ribs all to myself). Also, there are some healthy options if you look around. Be Our Guest even has quinoa salad which was pretty good.
Since I had just turned 21, I did over indulge in the drinks, so if you'd rather skip those you obviously have more freedom with food choices. I just love the fruity drinks by the pool. Each day I had 1-3 drinks, so that's easily at least 500 calories. Aside from the drinks though, I only drink coffee (like I said, 1-2 cups) and water--I don't drink soda or anything like that.
Basically everyone is different and will eat differently and walk more/less miles or some even manage to work out during their trip (though after a day in the parks I am way too tired to run and getting up at 6-7 is already early enough for me) so each person will see their weight differently, but just make smart choices and indulge, just don't go too crazy.
Whew, sorry for all of that, but hopefully that advice helps someone.
