They seem to work hard to hint that aspartame can prevent weight loss, but are there actually any studies that show that? There are plenty that show that it has the same effect as drinking water.

https://www.ncbi.nlm.nih.gov/pubmed/12324283

https://www.ncbi.nlm.nih.gov/pubmed/2349932

https://www.ncbi.nlm.nih.gov/pubmed/7146134

https://www.ncbi.nlm.nih.gov/pubmed/20303371

https://www.ncbi.nlm.nih.gov/pubmed/9022524

https://www.ncbi.nlm.nih.gov/pubmed/2178391

And the same for rats

https://www.ncbi.nlm.nih.gov/pubmed/11890951

https://www.ncbi.nlm.nih.gov/pubmed/3190217

https://www.ncbi.nlm.nih.gov/pubmed/15159141

edit Found an overview of the evidence for: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2892765/