Thanks for the replies and suggestions. I wonder if it is a food. I don't think its the strawberries with me, as sometime we can't get them, but it still happens. I'll have to try playing around with my veggies and see if that's it.
Could gluten do it? I've just started making biscotti and have used separated wheat gluten to make them stick together. No carbs, but maybe the gluten isn't good?