I am a 30-year-old male (183 cm tall), haven't done any sport in the last 4 years and gained around 30 kg.
My plan is to lose 25-35 kg (123 kg -> 88 kg) over the next 6 months.
To do that, I started to count calories and am trying to change my eating habits at the same time. For example, I am trying to drink more, drink before and during I am eating, have smaller portions, eat slower and only eat between 11 am and 7 pm.
If I understand everything correctly, to drop 35 kg, I need to cut my intake by: (35 kg * 7500 kcal/kg) / (6 months * 30 days/month) = 1458 ~ 1500. According to some websites I need 3000 kcal a day (2060 kcal + 940 kcal), meaning I would be allowed to only eat for less than 1500 kcal a day.
I tried this for a weak already and it was honestly fine. I need to get used to the smaller portion size.
Additionally, I am trying to do some sport again. In the beginning, I was planning on spending 20 minutes on the home trainer every second day (which would be around -500 kcal).
Does my plan sound reasonable? Any further tips or advice? I am aware, that my daily kcal is low, but I think it is manageable.