This site makes it easier for me to understand a portion size:
http://www.checkyourhealth.org/nutri...pd_visuals.htm
http://www.checkyourhealth.org/nutri.../pd_movies.htm
Concentrate on eating healthy food. Picture your plate divided into 4 quarters. When you fill the plate, follow these guidelines:
1 quarter - lean protein (lean meat, eggs, fish, soy, low fat dairy)
1 quarter - complex carbohydrate (brown rice, whole wheat pasta, quinoa, sweet potatoes, corn, oats, beans, whole grain bread, whole wheat pitas, whole wheat tortillas)
2 quarters - veggies (wide variety of brightly colored vegetables and fruit)
minimal - healthy fats
I do have a little food scale. I mainly use it for measuring pasta since it always looks so small uncooked, I find it hard to cook with the right amount. I use 2 oz of pasta. I also carefully measure:
* Breakfast cereal, because a true serving small is so small, it's easy to eat too much.
* Nuts/trail mix - really good for you, but packs a calorie wallop. A serving is 1/4 cup (medium sized handful)
Here's a nice site from Body for Life:
http://www.bodyforlife.com/nutrition/createmeal.asp