A study by
European investigators
concluded that artificial (non-sugar)
sweeteners [NSS] had no particular benefits for health.

Most health outcomes did not seem to have differences between
the NSS exposed and unexposed groups. Of the few studies identified
for each outcome, most had few participants, were of short
duration, and their methodological and reporting quality was
limited; therefore, confidence in the reported results is
limited.

However, the accompanying editorial
by Vasanti Malik
 concludes:

Based on existing evidence including long term cohort studies
with repeated measurements and high quality trials with caloric
comparators, use of NSS as a replacement for free sugars
(particularly in sugar sweetened beverages) could be a helpful
strategy to reduce cardiometabolic risk among heavy consumers, with
the ultimate goal of switching to water or other healthy
drinks.

On this basis, the Calorie Control Council, the trade group that
represents the makers of artificial sweeteners issued
a statement rebutting the study
:

In alignment with the conclusions made by Dr. Malik, the Calorie
Control Council agrees that the highest quality science supports
that LNCS [low- and no-calorie sweeteners] can be consumed as part
of a balanced diet and can assist with the reduction of
cardiometabolic risk through the management of body weight and
reduced caloric intake.

Given the proven safety and benefits of LNCS, consumers should
continue to be confident in including these ingredients as part of
a healthy diet.

Note the conditional “could” and “can.”  Artificial
sweeteners might help, but you can’t count on them for
miracles.