Secretion is a common problem in weight loss.
My method is to eat sesame seeds and three spoonfuls of yogurt every day (ordinary porcelain spoons will do). No matter how you lose weight, you won't be constipated! Weight will keep falling, and there will be no unhealthy worries.
Why don't you try it? For example, how many days do you have?
If I were you, I would eat more corn, boiled vegetables with pumpkin and so on (raw food is ok). Of course, please give up your usual food seat, and don't eat breakfast and lunch, pumpkin and vegetables, too much!