1 Ghrelin is a fast-acting hormone that plays a vital role in meal initiation and contributes to weight gain.  Leptin mediates long-term regulation of energy balance and suppresses food intake, thereby inducing weight loss.
For the military, as for the civilian world, it is not overstating the point to say that the advent of radio communications has changed almost everything. The meerkat or suricate is a small mammal and a member of the mongoose family.
restive - impatient especially under restriction or delay; the government has done nothing to ease restrictions and manufacturers are growing restive. impatient - restless or short-tempered under delay or opposition; impatient with the slower students; impatient of criticism.