Many usage guides have disparaged preventative as improper, because it doesn't accord with classical roots: the Latin past participle stem praevent- adds -ion to form prevention and -ive to form preventive. Words ending in -ative ought to have the -at- in the root already: demonstrat- begets demonstration and demonstrative, narrat- begets narration and narrative, and so forth. Since we don't have preventation, then preventative is equally misbegotten, by this way of thinking.
Learning about the disease and actively participating in the treatment is important, since complications are far less common and less severe in people who have well-managed blood sugar levels. The goal of treatment is an HbA1C level of 6.5%, but should not be lower than that, and may be set higher. Attention is also paid to other health problems that may accelerate the negative effects of diabetes. These include smoking, elevated cholesterol levels, obesity, high blood pressure, and lack of regular exercise. Specialized footwear is widely used to reduce the risk of ulceration, or re-ulceration, in at-risk diabetic feet. Evidence for the efficacy of this remains equivocal, however.
In 1991, the National Institutes of Health issued a consensus statement, cautiously recommending surgery as a treatment for people living with morbid obesity, meaning they have a body mass index, or BMI, over 40. For people who have health complications connected to obesity, such as type 2 diabetes, the limit goes down to a BMI of 35. Relying on these guidelines, insurance companies and public payers like Medicaid and Medicare typically only cover surgery for people living with diabetes who fall into that category.
When the glucose concentration in the blood remains high over time, the kidneys will reach a threshold of reabsorption, and glucose will be excreted in the urine (glycosuria). This increases the osmotic pressure of the urine and inhibits reabsorption of water by the kidney, resulting in increased urine production (polyuria) and increased fluid loss. Lost blood volume will be replaced osmotically from water held in body cells and other body compartments, causing dehydration and increased thirst (polydipsia).
There is, in fact, no difference in meaning between preventive and preventative. Some, including William Safire in a 1993 On Language column, have suggested using preventive as an adjective and preventative as a noun, but both forms of the word have alternated freely as adjective and noun since they entered the language in the 17th century. Despite their introduction into English at roughly the same time (the Oxford English Dictionary dates preventive back to 1626 and preventative to 1655), preventive has won out as the preferred version.