Why am I not losing weight?

[PuppyDay]

I am late 40s and in the last year I’ve put on 4kg. I want to lose it before the summer holidays and to get back to my normal weight and size. I have a lot of nice clothes that currently don’t fit well and I want to get back to them too.

for three weeks I have tracked calories in MyFitnessPal and stick to 1,500 a day. I intermittent fast and only eat in a seven hour window. I drink only black coffee, herbal tea and water. This is a big reduction in what I eat and I’m hungry a lot of the time. I go to the gym five times a week and do 10km on the bike and resistance 10 keeping rpm over 100 and by the end I’m covered in sweat. I then do 20 mins of weights. I also walk 10,000 steps or more each day.

in three weeks of this I have lost 0.3 of a kg. No more. Why????

Thanks for all the messages. I feel there is a lot to digest here (or not digest if I keep calorie restricting). Some ppl say restrict calories more, some say restrict them less, some say forget about calories and worry about macros. So the diet stuff is confusing!

There does seem to be more consistent agreement that I should weight train more and do less cardio so today I didn’t do the bike and did all weights. It felt odd going straight to weights without being all warmed up and hot and sweaty. It did mean I could lift more though as I was less tired.

Have you worked out your basic metabolic rate? I'm 5'11 and my baseline calorie burn is 1800 a day without lifting a finger. You should start there imo

100%
I put on 4kg last month from working out, it was water retention. I think it can be so confusing as people think diet and exercise make the scale go down. It does eventually
I had a break for a few weeks and it all whooshed off and I was left with less fat and more muscle than before. So worth it!