Half a croissant, on a plate, with a sign in front of it saying '50c'
h a l f b a k e r y
Expensive, difficult, slightly dangerous, not particularly effective... I'm on a roll.

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Technomeals

 A plate that displays nutritional information of what you are eating.
 
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The new generation of diet systems. A set of 3 pieces: plate, bowl, and glass; that display the nutritional information of what is served in them. You can also connect the dish to your computer and keep a record of what you ate and when. Ideal for doctors and nutritionists to use with their patients, and of course for people with obesity problems, high blood pressure, high cholesterol, or people that just want to eat right.
—fesquivel, Sep 19 2005

Athenaeum's version Calo_20Meter
[DrCurry, Sep 19 2005]

Bristol Z's take on this Rapid_20Goober_20Detector
Oriented more toward peanuts and other no-nos. [DrCurry, Sep 19 2005]

everlasting's take calorie_20and_20nutrition_20analyzer
[DrCurry, Sep 19 2005]

[link]






       Hm...people have suggested things very like this before, except as hand-held meters (presumably so you can use them in restaurants).
—DrCurry, Sep 19 2005
   

       Any idea how it might work?
—gnomethang, Sep 20 2005
   

       Divide the plate into three sections, one marked "vegetables", one marked "rice", and one marked "meat". So long as you only put the correct food in each section, the plate can sense how many mouthfuls you have eaten (noting the decrease in mass after each poke with the fork), and thereby estimate the number of calories/fat/vitamins consumed.   

       Further, since each section is earmarked for a different food type, the plate may be able to sense the density or color of the vegetable placed on the vegetable section (or the meat placed on the meat section), and thus, assuming calories/vitamins are somehow correlated with the material's physical properties, estimate the number of calories/vitamins consumed.
—phundug, Sep 20 2005
   
      
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