Types of Diabetes Mellitus

"Diabetes" is several different conditions sharing one finding - high blood sugar. The type decides the treatment from day one.

Type 1 diabetes

• Autoimmune destruction of insulin-producing cells - absolute insulin deficiency
• Usually begins in childhood, adolescence or young adulthood, often abruptly
• Insulin is not optional here - it is life support, from diagnosis onward, for life

Type 2 diabetes

• Insulin resistance plus a gradually tiring pancreas - the vast majority (around 90%) of all diabetes
• Linked to family history, belly fat, inactivity, age - increasingly appearing in the 30s in India
• Managed with food, movement, tablets, and sometimes insulin later - needing insulin is the disease progressing, not the patient failing

Gestational diabetes

• First appearing in pregnancy, usually mid-pregnancy; screened for universally because it affects the baby's growth
• Usually resolves after delivery - but it is a loud warning: half of these mothers develop type 2 within years without lifestyle care

Prediabetes

• Sugar above normal, below the diabetes line (fasting 100-125, HbA1c 5.7-6.4%)
• The most important "type" to know - because here, lifestyle change genuinely turns the ship around

The rarer ones

• MODY and other genetic forms: young-onset, strongly familial patterns that need specific diagnosis
• Secondary diabetes: from pancreatic disease, long steroid use, or other endocrine conditions

One-line summary

Type 1 is autoimmune and insulin-for-life, type 2 is the lifestyle-linked majority, gestational is pregnancy's warning shot, and prediabetes is the reversible fork in the road - the label matters because the treatment follows it.