Potatoes are the starchy, tuberous crop from the perennial nightshade Solanum tuberosum. A Harvard study of 120,000 men and women found potatoes to be a particular culprit of weight gain and diabetes. Potatoes do contain important nutrients but replacing potatoes with whole grains and other vegetables is likely to reduce the risk of weight gain and diabetes.
Canola oil is produced from the rapeseed plant, the third-largest source of vegetable oil in the world. The "Can" part stands for Canada and "ola" refers to oil. Canola oil is low in saturated fat and contains both omega-6 and omega-3 fatty acids in a ratio of ~2:1 as well as monounsaturated fat.
Palm oil is an edible vegetable oil high in saturated fat derived from the fruit of the oil palms. Along with coconut oil, palm oil is one of the few highly saturated vegetable fats and is semi-solid at room temperature.
Common salt is a mineral composed primarily of sodium chloride. Salt is essential for animal life, and saltiness is one of the basic human tastes. In general, Americans should limit daily sodium consumption to 2,300 milligrams, but this is an upper safe limit, not a recommended daily allowance.