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• The Serving Size (red line) is the food's weight from the label. Note that some foods will not show a weight, and will just have "Tbsp" or "fl. oz". If so, just select the right choice for the units (where it says "grams" in the picture).

• The Serving Name (no line) This is a descriptive name--it can be anything. "Serving", "Bar", "Fruit", etc.

• The Equals by Measure (blue line) This is for the Measurement quantity from the label (not all foods will include this.) As long as you put in one, GTZ Fitness will do all the math to convert and show all the other different measurement choices for you.

  For example, by putting in the measurement by Cup here, when adding a food to a meal, you will have all the "tsp", "Tbsp", and "Cup" choices. You just need to enter the one measurment listed on the food label.

• The Package value (green line) lets you later say you ate "1/2 Can".

  This is much easier for you than having to look up the serving size and the package contents to do all the math yourself. Just fill in the number of servings in a package and GTZ Fitness will automatically calculate that when you put "1/2 Can" in a meal, it really means "1.75 Servings".

There are more items listed on a food label, but only Four nutrition details are required.

How GTZ Fitness Assigns Grades.

Grades are automatically assigned based on several criteria. Accounts must be active at least 7 days for a grade to be calculated.

1: GTZ Fitness looks at how many of the past 7 days that food has been tracked. It does not look at how close the numbers are to the targets--just that they've been tracked at all.

• 7 days is an A
• 6 days is a B
• 5 days is a C
• 1-4 days is a D
• 0 days is an F

2: GTZ Fitness adds a "+" or "-" to the letter grade based on how many of the past 7 days have Exercise Notes.

• 3 or more days adds a "+"
• 0 days adds a "-"

3: Extra Credit

• Tracking 3 or more days of exercise will add one bonus to the days with foods tracked. So you could miss 1 day tracking foods and still get an A. Or track no foods and exercise and get a D+.

To get an A or A+ you just need to track your foods every day, and add notes when you exercise.

Grades are re-calculated every night based on the 7 days previous.

GTZ Fitness Calorie Math.

You may notice that the percents don't quite add up sometimes on the Nutrition Report page. There are a couple reasons this can happen.

1: Alcohol. Food labels do not include information about alcohol content. The calories will be correct on the label, but the nutrients entered won't add up if you do the math because you have 0 for an important number. Alcohol has almost as many calories per gram as Fat does!

2: Rounding. Food labels show most values as numbers without a decimal. The fat may really be 1.4 or 0.8 but is rounded to 1 on the label. Similarly for calories, most food labels round to the nearest 10; they show 100 calories, not 103.5 calories.

* The math used is:
Calories = 9x(Grams of Fat) + 4x(Grams of Carbs) + 4x(Grams of Protein).
The math really should also include + 7x(Grams of Alcohol) but the data is not available.