Meal delivery services have been reviewed and ranked by various outlets, with some focusing on healthy options and others on specific dietary needs such as weight loss, gluten-free, or diabetic meals. The reviews appear to be based on testing and input from registered dietitians, with different outlets highlighting different top-rated services. The number of services tested and the top recommendations vary across the outlets, with some citing specific numbers of services reviewed, such as 18 or over 50.