UPDATE! I’ve added a bonus Venn diagram about healthy snacks that you can use the same way.
This quick activity is a great way to review Spanish food vocabulary. The Venn diagram is about desserts, and students can brainstorm as many foods as they can remember by separating them into "healthy" and "unhealthy" categories. The middle section can be for foods that could go either way or have both health and unhealthy aspects to them, i.e. popcorn or frozen yogurt.
As a follow-up activity, consider having students compare their answers with others. More advanced students can debate the placement of foods by explaining why they are or are not healthy.