Porto do Sabor is a very well know franchise for snacks in Rio de Janeiro. I used to study close to…read morethis place, and I loved it (so did my classmates).
With excellent prices, fast service, many delicious options to choose from (including some healthy ones), this place is great. Expect to find juices, salads, oven-baked savory treats, and sandwiches.
They are very well known for their açaí. What I love about their açaí is that the price is excellent and it includes fruit and granola (in some places you have to pay extra for that). It's definitely a must try.
I also quite enjoy their "sanduíche montado", which was my school lunch many times, and their croissants.