Never heard of Ronaldo, but good for him! Only use sodas as treats. Have you ever seen the picture with sugar cubes stacked up next to various drinks? It is alarming how much sugar you consume with them. And even the sugar-free versions have downsides because of their chemicals and what they do to your body. I hope this shames other athletes into refusing endorsement for soft drinks, fast food, etc.
Along the “eat a little less” line of thinking, I know someone who cut out sodas and quickly lost a lot of weight. That was his only change.
Update: Feeling hypocritical now (but not too much), as I drank 40 oz. of Coke for breakfast the day after I posted this. I was getting a CT scan as part of my cancer follow-up (all clear, praise God!) and they make you drink a lot of something sugary before the scan. I picked cranberry grape juice, then changed my mind to Coke, forgetting how much you have to drink. I was wired.