This is also called Insulin-dependent diabetes mellitus, type I, and this can occur in adults as well.
If a person refrains from consuming carbohydrates and sugars, the brain gradually withdraws the secretion of insulin. If this happens, the person gets type-2 diabetes mellitus, requiring the intake of insulin tablets. In brief, this is known as non-insulin dependent diabetes mellitus (NIDDM). In practise, these people are normally given with insulin tablets only.
On the other hand, if the person happens to take far too much of sugar frequently, and also on a daily basis, he/she would develop this insulin-dependent diabetes.
With optimum sugar/carbohydrate consumption, optimum insulin secretes.
With excessive sugar/carbohydrate intake, in order to digest all of it, excessive insulin secretes.
If such excesses go beyond the body’s tolerance limit, i.e., the threshold point, then, the brain, with a view to saving the person from undesirable collapse, suddenly and totally withdraws the secretion of insulin altogether.
This situation results in creating a need for insulin injections for digesting subsequent sugar/ carbohydrate consumptions. Thus, the patient develops a dependency for insulin from external sources.
This happens in a manner identical to the development of hypothyroidism, leukaemia, etc., in that the result due to the production of self-destructing auto-antibodies by the brain. It is an auto-immune disease.
See Diabetes Mellitus, Types I & II.