You can find here[0] a lot of progress pics from ppl, who lost a lot of weight with simple cico[1]. I do PSMF[2] sometimes for 1-2 Weeks when I feel to lose 1-4kg.
[0] https://www.reddit.com/r/progresspics/ [1] calories in, calories out [2] https://en.wikipedia.org/wiki/Protein-sparing_modified_fast