Bacteria (/ b Ã¦ k Ë t ÉªÉr i É / ( listen); common noun bacteria, singular bacterium) constitute a large domain of prokaryotic microorganisms. Typically a few micrometres in length, bacteria have a number of shapes, ranging from spheres to rods and spirals.
junk food. n. (Cookery) food that is low in nutritional value, often highly processed or ready-prepared, and eaten instead of or in addition to well-balanced meals. junkâ² food`. n. 1. food, as potato chips or candy, that is high in calories but of little nutritional value. 2. anything that is attractive or diverting but of negligible substance.
Junk foods are typically ready-to-eat convenience foods containing high levels of saturated and / or trans fats, salt, or sugar, and little or no fruit, vegetables, or dietary fiber; and are considered to have little or no health benefits.unk food consumption alters brain activity in a manner similar to addictive drugs. After many weeks on a junk food diet, the pleasure centers of our brains become desensitized, requiring more of the junk food for pleasure. Junk or unhealthy fast foods have become a part of our busy lifestyle.