Oshidori-san no Uwaki Meshi

A married couple appears to have the perfect relationship. Teru Oshidori works at a major supplement company and lives happily with his wife Shino, a yoga instructor who carefully manages their healthy lifestyle. They are seen as the ideal “lovebird couple” (“oshidori fūfu” in Japanese).
But both spouses are hiding secrets.
Teru’s “affair” is not another woman — it’s junk food. Behind his wife’s strict health-conscious cooking, he sneaks out to indulge in massive high-calorie meals, comfort food, sweets, and binge eating sessions to relieve stress. Every secret meal feels like forbidden adultery.
At the same time, Shino also begins hiding suspicious behavior of her own, creating misunderstandings, jealousy, and tension between them.

Original Webtoon