Reddit's Appetite: Predicting User Engagement with Nutritional Content

TL;DR

This study analyzes how nutritional content influences user engagement on Reddit food posts, finding that higher calorie density correlates with increased comments and engagement.

Contribution

It introduces a large-scale analysis of nutritional factors affecting online food content engagement and demonstrates the predictive value of nutritional features using machine learning.

Findings

Nutritional content improves engagement prediction accuracy by nearly 5%.

Higher calorie density is positively associated with user engagement.

Analysis of half a million posts reveals nutritional differences between engaging and non-engaging content.

Abstract

Food communities on online platforms enjoy great popularity among social media users. Due to the far-reaching consequences of food-related content on user eating behavior, recent research has studied the factors that drive user online engagement with food. While most of these studies have focused on visual aspects of food content in social media, only a few initial studies have explored the impact of nutritional content on user engagement. In this paper, we set out to close this gap and analyze food-related posts on Reddit, focusing on the association between the calories and macronutrients of a meal and engagement levels, particularly the number of comments. To that end, we collect and analyze almost half a million food-related posts and uncover differences in nutritional content between engaging and non-engaging posts. Moreover, we train a series of XGBoost models, and evaluate the importance of nutritional content while predicting user engagement and how posts will resonate with the community. We find that nutritional features improve the baseline model's accuracy by almost 5%, with a positive contribution of calorie density towards the prediction of engagement, suggesting that higher nutritional content is associated with higher levels of user engagement in food-related posts. Our results provide valuable insights for the design of more engaging online initiatives aimed at, for example, encouraging healthy eating habits.