Which disease does deficiency of insulin lead to ?

Explanation

**Step-by-Step Solution:**

1. **Understanding Insulin**: Insulin is a hormone produced by the pancreas, specifically by the beta cells of the islets of Langerhans. It plays a crucial role in regulating blood sugar levels in the body.

2. **Function of Insulin**: The primary function of insulin is to lower blood sugar levels. When blood sugar levels rise (for example, after eating), insulin is released to help cells absorb glucose, thus reducing blood sugar levels to a normal range.

3. **Consequences of Insulin Deficiency**: When there is a deficiency of insulin, the body cannot effectively regulate blood sugar levels. This leads to elevated blood sugar levels, which can cause various health issues.

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