surreptitious \suhr-uhp-TISH-uhs; suh-rep-\, adjective:
1. Done, made, or gotten by stealth.
2. Acting with or marked by stealth.

While men's appetites are driven by availability, women's are often driven by cravings. A dab of chocolate here, a pinch of sugar there, and some surreptitious midnight Dairy Queen runs lurk behind a woman's oh-so-virtuous bran breakfast, salad lunch, and grilled fish dinner.