Have a plan of what you will eat - then you don't need to rely on will power; instead, you just need to rely on your plan. And automate meals to some extent.
Tea, coffee, a flavored-water drink, an occasional diet soda, pickles, cucumbers, and crunchy veggies can help take the hunger edge off.
High protein meals and snacks -- hard boiled eggs are a favorite of mine --- I make a huge batch at the beginning of every week.