Question: What do I need to know about vegetables and their effects on my weight and health?
Answer: Vegetables are a nutrient powerhouse.
For the calories that you get, you get a tremendous amount of different vitamins, phytochemicals, which are plant chemicals that aren't essential like vitamins but they provide a number of health benefits. Both for health and for weight, we'd recommend all the fresh or frozen vegetables that people want.
We often try and tell people what not to eat -- this is a positive message: For good health, eat a variety of vegetables and you can eat almost as much as you want.