Hi Mari, teacher Rachael gave you a good answer. I would also add that "associate something with something" is typically formal English. As an example, think of associates of a law firm or aspects of science or business. A sentence could be "He's often associated with great deals." To remind someone of something is more everyday English that we use. So, in your example, all native speakers would say (2) as it sounds a lot more natural than (1).

Both sentences work. The two terms can both mean that one thing makes you think of something else because it is similar in some way. So in your example, reading the detox article made you think about your ketogenic diet. The difference between them is how or why you think about it. 1) "Associate with" has more of a relationship aspect to it. It shows that the 2 things are related or work well together. For example, I associate running with being healthy. In this case running helps you be healthy, they are related. In your example, when you read the article, it made you think about your diet because they are both health related and can work together to help you become healthier. 2) "Reminded me of" indicates that the previous thing made you remember something you may have forgotten or hadn't thought about in a while. For example, making kimchi jeon reminds me of my time living in Korea. In this example cooking Korean food makes my memories of Korea come to the front of my mind. In your example, reading the detox article may have reminded you of certain aspects of the ketogenic diet because they are similar. You weren't thinking about your diet before reading the article, but you were afterwards. In conclusion, both sentences can work. The one you choose depends on your thought process. However, to make your sentences better grammatically, I would just suggest to add "the" before "ketogenic". (I associated it with the ketogenic diet that I'm going on. / It reminded me of the ketogenic diet that I'm going on.)