India's Food Regulatory Body Food Safety and Standard Authority of India (FSSAI) has set a maximum limit beyond which edible oils become unsafe and must not be reused.
To save cost, restaurants and vendors reuse oils for deep frying which is very unhealthy and unsafe.
Oils undergo chemical changes when heated, which can cause health issues like acidity, bad cholesterol, blocked arteries and cancer over a prolonged period of time.
Ayurvedic medicines for Diabetes !