Laxatives vary based on how they work and the side effects they have. Certain stimulant, lubricant and saline laxatives are used to evacuate the colon for rectal and bowel examinations, and may be supplemented by enemas under certain circumstances. Sufficiently high doses of laxatives may cause diarrhea.
Most vegetables, with the exception of onions, mushrooms and tomatoes, should be blanched briefly before being dehydrated to limit discoloration and the risk of food-borne illnesses. You can dehydrate tomatoes, carrots, beets, greens, beans, squash, onions, peas, celery, corn, pumpkin and broccoli with good results.
Berries, like blueberries or grapes, can be a challenge on the dehydrating front. They are small, but a contained unit. Most berries are small enough to be dried whole, but large grapes should be cut in half. If you want to dry seeded grapes, you can cut them in half to remove the seeds and then dry them.