Three solid meals per day, as well as a mid-morning and mid-afternoon snack. That's what dieticians worldwide recommend. This helps to control blood sugar levels, which, in turn, prevents cravings for fatty and/or sugary foods. But eating too much at snacktime, even wholesome foods, isn't a good idea.
Don't snack directly from a package – unintentionally, you may end up eating the entire contents; portion out one handful of a snack onto a plate or napkin; choice of food is also important – fruits and vegetables make excellent snacks, especially since their proportion of nutrition to kilojoules is generally good; and pack a healthy snackbox to take to work – it's often here that one tends to binge on unhealthy treats.