This window is what you see first on starting Gnutrition:
On the left hand side, three icons are visible for the three modes:
List of foods eaten in a day, to calculate total intake
Views a particular recipe.
Analyses a Single Food
The Single Food screen is good place to start. By clicking in the ``single banana'' icon, this screen in displayed:
This allows you to enter a particular food and receive a report about its nutrient content.
Gnutrition can only analyse the foods present in its database. Press the ``Search'' button, to show the search window:
As this box shows, you may search by the text name or by the nutrient content.
In this example, I searched by the word ``apple'' The database produces dozens of options for this word, such as ``Babyfood, fruit, applesauce, strained'', or ``Pie, apple, prepared from recipe'' This are displayed in a tree format, with the first word forming the header, the second the sub-header, etc. You must explore the tree to find the one you what, cicking on the little pluses, explodes the sub-hierarchy of foods. In this example, I have selected ``Apples, raw, with skin'':
In the ``Search'' window, ``Nutrient Search'' can be selected:
Foods are selected by their nutrient content. ``Content'' can be assessed by grams (weight), or calories (energy).
You can maximise nutrients, selecting foods rich in those nutrients, or minimise nutrients, selecting foods low in that nutrient.
The ``constraint'' refers to a weighting given to each nutrient in computing its score. So nutrient with a constraint of 3 will be three times as important in calculating the score, as one with a constraint of 1.
The minimised nutrients have a negative constraint, as they subtract from the score. The search gives the foods with the highest score by this method.
The foods are displayed in a tree as for the ``Search by Name'' box.
When you have found the food you what, press the ``OK'' button, and you will return to the main screen with your food selected:
You must first select the unit you are measuring in, in this case I have selected "large" (i.e. large apple), and the amount, in this case one.
Results are then shown for lots of nutrients. Different classes of nutrients are selected by the tabs ``Macro-nutrients'', ``Minerals'', etc. The percentage of RDI (recommended daily intake) is also displayed for the nutrients based on your height and weight as entered when you first ran the program.
To understand what all these mean, refer to the Nutrient Notes.