No. That's why you have a calorie range; as long as your substitutions don't put you over your calorie range, they won't sabotage your efforts. Keep things equivalent, though; the meal plans are designed to provide proper macronutrient balances, so if you take a protein off, and replace it with say, a simple carb, you can increase cravings and end up more likely to binge and overeat. If for example, though, you don't like turkey, and instead swap it out for an equivalent amount of chicken, that's not going to change much of anything. :)
Writer, mother, wife, and breadwinner. I love to run, but running doesn't love me, so I'm switching to my low-impact bike.
I'm not pregnant, just fat: My blog. fatnotpregnant.blogspot.com/
| current weight: 190.6