Robert Lustig's Sugar: The Bitter Truth hammers on fructose being a major culprit to weight gain:

https://www.youtube.com/watch?v=dBnniua6-oM

Dr. Gil Carvalho (medical doctor, research scientist, science communicator) debunks parts of Lustig's 30-year-old claims:

https://www.youtube.com/watch?v=vdoDx9dIuNE

Nonetheless, Dr. Carvalho agrees with avoiding sugary drinks:

"We have a lot of recent evidence, recent studies after [Lustig's] talk. The link between soda and weight gain and obesity and other chronic diseases is quite strong."

Drink fewer sugary beverages, consume fewer calories (eat less), exercise, and drink less alcohol.