...IF you plan to burn them off with exercise NOW. This is one of the lessons i'm taking away from my vacation experience.
While i was stoically trudging up and down the hills of Seattle, the rice and potatoes i ate didn't seem to mess me up. I'd hike all around after the breakfast that included hash-browns (because no lone omelette is big enough to sate me except the ones at Billie's!), and before and after lunch/dinner (which sometimes included dessert) as well, in order to try different wonderful restaurants in the area. I vowed to myself to bring along a pedometer on all future trips during which i expect to do a lot of walking, just to satisfy my curiosity.
My jeans didn't fit any differently till we got on the train to return home, and i continued the potato-and-rice-including regimen without putting in the mileage. My ability to delay meals markedly declined, as well as "muscle energy." I felt generally less resilient, and distinctly more gassy. Trying to carry luggage up the steep narrow rail-car stairways caused my knees to refuse to straighten.
Back at home, i won't be getting as much or the same kind of exercise. Walking on the flats around my neighborhood with the dog won't give me the same kind of workout i got last week -- for which my back will be grateful! Climbing the countless stairs that i do at home doesn't compare, either. Even if i cared to continue the higher-carb diet (which i DON'T!) i couldn't justify it through energy expenditure, and WOULD gain fat on it.
Exercise like a mad person just so i could eat these bland foodstuffs??? Gag! I'm a hedonist! I want my rack of lamb ... which, coincidentally enough, is for dinner tonight!