RNA. A type of nucleic acid consisting of nucleotide monomers with a ribose sugar and the nitrogenous bases adenine (A), cytosine (C), guanine (G), and uracil (U); usually single-stranded; functions in protein synthesis and as the genome of some viruses.
Underactive thyroid Photo Credit George Doyle/Stockbyte/Getty Images. It's hard to lose weight when your metabolism slows down, but there are things you can do. The thyroid, a butterfly-shaped gland in your throat, produces hormones that regulate many bodily functions, including metabolism.ollow a low-calorie diet. Anyone who wants to lose weight must burn more calories than are consumed. Unfortunately, for someone with an underactive thyroid, it can be difficult because the metabolism slows, meaning the body naturally burns fewer calories.
Potent physical or emotional stress can cause an overactive thyroid in those people who have the underlying genetic background, says Singer. Too much thyroid hormone speeds up metabolism.People lose weight, their heart beats rapidly, they have palpitations. It feels like you're amped up, says Singer.otent physical or emotional stress can cause an overactive thyroid in those people who have the underlying genetic background, says Singer. Too much thyroid hormone speeds up metabolism. People lose weight, their heart beats rapidly, they have palpitations.