[header] How to put your husband on a diet without him knowing it [title] Don't buy junk food. [step] In addition to having limited nutritional value, junk food often contains too much fat and too many calories, sodium, and sugar. If you're not the primary grocery shopper, you may want to consider temporarily taking over the responsibility. 
It's important to get your husband into healthy eating habits by steering him away from junk food. Doing so, begins at the grocery store with the choices you make.