Flush your drains with an enzyme drain cleaner frequently.
Pour boiling water into your kitchen drain once a week to help melt any built-up fat.
Install a strainer over your drains that will help to trap food, soap, hair and other obstructions. Make sure to clean it out frequently.
Mix 3/2 a cup of vinegar and a handful of baking soda and pour it down your kitchen drain once a week. This helps to break down any built-up fats and will also help your drain to smell fresh.
Rather than pouring them down your sink, collect any fats or grease in a container and throw it away. These tend to solidify within your pipes, which can lead to clogs.