Weight Watchers has some little tips which are especially helpful when you don't have your scale along with you. For example:
The palm of your hand (minus fingers) = 3 ounces of meat, fish, or poultry. I don't recommend actually placing the food in your palm, especially while at fancy restaurants.
Filling one cupped hand = 2 ounces of nuts or pretzels. I had to laugh at that one, I think my whole family with both hands cupped together equals what I used to consider a serving of pretzels.
Whole thumb (tip to base) = 1 ounce of meat or cheese and
Thumb tip (tip to first joint) = 1 tablespoon. "Thumbs up" to ensure proper measuring!
Closed Fist = 1 medium whole fruit. This can be a tough one because I have difficulty finding fruit with knuckles.
Index finger (1st to 2nd joint) = 1 inch. Note I said Index finger, not to be confused with middle finger, which I mistakenly used at the deli resulting in a near black eye.
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"My doctor told me to stop having intimate dinners for four. Unless there are three other people." Orson Welles