"Portions" lets you enter and track your food consumption, using the Canada Food Guide as a benchmark for daily recommended intake. "Portions" is divided into three screens that allow you to enter or to view your portions.
The "Entry" screen allows you to enter your food intake and weight for any day. You enter your portions for the four food groups: fruit & vegetables, grain products, dairy, and protein. There is a section for junk food, but this has a negative impact on your percentage. The daily percentage (think of it as a score) is based on how close your consumption matches the daily recommended amounts.
The "Calendar" screen shows a monthly summary where each day is colored based on the percentage from the Entry screen. Press any day to see the number of portions consumed on that day.
The "Portions" screen is a handy reference to what constitutes a portion in each of the four food groups (vegetables, grains, dairy and protein).
The "Chart" screen shows a graph of the last month of percentage and weight.
There is also a "Portions" section in the iPhone Settings application that allows you to specify your age and gender, as well as how long to keep your entries for. Be sure to set this up before using Portions, as the recommended daily amounts differ based on age and gender.
"Portions" isn't guaranteed to help you lose weight, but it will let you know whether or not you're eating healthy or not.