DietDelta: A Vision-Language Approach for Dietary Assessment via Before-and-After Images

• URL: http://arxiv.org/abs/2604.06352v1
• Date: Tue, 07 Apr 2026 18:30:31 GMT
• Title: DietDelta: A Vision-Language Approach for Dietary Assessment via Before-and-After Images
• Abstract summary: We propose a vision-language framework for food-item-level nutritional analysis using paired before-and-after eating images.<n>Our method leverages natural language prompts to localize specific food items and estimate their weight directly from a single RGB image.
• Score: 9.480328219158254
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Accurate dietary assessment is critical for precision nutrition, yet most image-based methods rely on a single pre-consumption image and provide only coarse, meal-level estimates. These approaches cannot determine what was actually consumed and often require restrictive inputs such as depth sensing, multi-view imagery, or explicit segmentation. In this paper, we propose a simple vision-language framework for food-item-level nutritional analysis using paired before-and-after eating images. Instead of relying on rigid segmentation masks, our method leverages natural language prompts to localize specific food items and estimate their weight directly from a single RGB image. We further estimate food consumption by predicting weight differences between paired images using a two-stage training strategy. We evaluate our method on three publicly available datasets and demonstrate consistent improvements over existing approaches, establishing a strong baseline for before-and-after dietary image analysis.

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