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No type 1 cannot be treated without Indulin, have high protein diet and regular exercise

For Type 1 diabetes only insulin is the solution

Type 1 diabetics need life long insulin. Type 1 diabetics can be underweight due to multiple reasons 1. Absolute insulin deficiency - less lean mass 2. Poor glycemic control leading to weight loss 3. Coexisting coeliac disease First step is to optimise glycemic control with premeals 90-130 and post meals 140-160 with minimal hypos and Hba1c <7. You'll likely gain weight if you have optimised your glycemic control well.

Type 1 dm only controlled with insulin Insulin it selt cause weight gain

No..for type 1 diabetes only insulin is treatment

Type 1 Diabetes is insulin dependent. So you need to take insulin only.