Diabetes can be discouraging pretty well; a victim needs support and encouragement. Without encouragement, he could struggle to recover from the shock of the fact that he lives with a lifelong disorder.
This can make it difficult for him to adapt and live his normal life. That's why everyone (including you) needs to learn how to care for diabetic people.
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The initial thing you need to do is to know regarding the disease; causes, cures, treatment, symptoms, and management. Knowledge is power.
It is when you know something you have the power to effectively control; even diabetes. When you know about the disease, then you will be able to effectively care for these people (people with diabetes mellitus).
The basic fact you need to know about diabetes is that it has no cure. It can be treated and managed. When not effectively treated, it can cause serious complications and permanent damage. For this reason, ever, for any reason, deter a diabetic taking her treatments and medications. Instead, give him encouragement.
Another way to take care of a diabetic is to educate about the disorder and help him understand that he can still enjoy good health and long life, even with the disorder. Help him to take her diets and exercise seriously. It should never wear socks and shows tight and should be cautious not to hurt his toe (or any part of his body).