What is the weight that should be considered as a starting point? If someone wants to lose 130 kilos to 110 kg in four months, that is an acceptable goal.
However, going from 80kg to 60kg is a staggering 25% drop in four months. It is not recommended, although it is not impossible. My weight loss rate was 1kg every week after starting at around 80kg.
After 10-12 weeks it dropped to 1 Kg per month. The plateau was around 65kg after reaching an all-time low of 64kg within 8 months. I strongly recommend avoiding refined carbohydrates (sugar, rice, wheat, pasta, pizza, bread, idly/dosa/roti/up puma/chapati, juice, sugary drinks and even fruit and milk).
How can I lose 15 kg in 3 weeks with little or no exercise?
I started walking 2 km a day, slowly reaching 10,000 steps. At the end of two months, I lost 15 kilos. I used to avoid a meal three times in a day because my basal metabolic rate is low. But eating in a 400–500 calorie can help in rapid weight loss. Take proteins as your meals.