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“Cooking can destroy nutrients, but it depends on the method of cooking. Frying and boiling leads to more nutrient loss than steaming and microwaving,” says Hafiz M. Rizwan Abid, M.S. , a ...
Basically -- eggs are mostly made up of water and protein. When things heat up, the proteins start moving around and form bonds with other proteins until they get so tangled up that they form a solid.
The U.S. Food and Drug Administration (FDA) now classifies eggs as a “healthy, nutrient-dense" food, according to a new proposed rule. Registered dietitians react to the change.
Boiled eggs are typically from a chicken, and are cooked with their shells unbroken, usually by immersion in boiling water. Hard-boiled or hard-cooked eggs are cooked so that the egg white and egg yolk both solidify, while soft-boiled eggs may leave the yolk, and sometimes the white, at least partially liquid and raw.
The first step in blanching green beans Broccoli being shocked in cold water to complete the blanching. Blanching is a cooking process in which a food, usually a vegetable or fruit, is scalded in boiling water, removed after a brief timed interval, and finally plunged into iced water or placed under cold running water (known as shocking or refreshing) to halt the cooking process.
A 1991 assay for the Journal of Food Science detected substantial avidin activity in cooked egg white: "mean residual avidin activity in fried, poached and boiled (2 min) egg white was 33, 71 and 40% of the activity in raw egg white." The assay surmised that cooking times were not sufficient to adequately heat all cold spot areas within the egg ...
Compare that to, say, an omelette made with greens and vegetables, a poached egg on whole-grain toast, hard-boiled eggs and fruit on-the-go, or breakfast tacos with avocado and fiber-rich black beans.
Many processes designed to preserve food involve more than one food preservation method. Preserving fruit by turning it into jam, for example, involves boiling (to reduce the fruit's moisture content and to kill bacteria, etc.), sugaring (to prevent their re-growth) and sealing within an airtight jar (to prevent recontamination).