The Filipino people love to eat. They are serious lovers of food of all sorts, and they will proudly tell you that old school habits dictate eating five times a day: breakfast, meryenda (snack), lunch, meryenda, and dinner.
The one thing that you will not lack for in Manila is food. From street food to home cooked Filipino meals to Chinese food to Italian food to burgers - you can have whatever it is that you are craving for!
For Filipino cuisine, your head will spin due to the overwhelming number of choices. There are two restaurants that I will recommend to anyone, though: Adarna Food and Culture and Serye Cafe Filipino. The former is a wonderful blend of ambiance and local food, an experience that will make you fall in love with the cuisine. The latter is a chain, but their Filipino food is almost as good as what you can expect to have if you're invited to a Filipino house for a meal.
If you're the sort who needs his pasta fix, then you will love the proliferation of Italian restaurants in the metro. For this type of cuisine, I suggest two other restaurants: Italianni's and Casa Nostra. The first one is a huge chain, and you will certainly enjoy their food wherever you are in the city. The second one is an Italian restaurant Manila is very lucky to have with its simple but mouthwatering and belly busting creations.
If you have the time, you also need to go on a Chinatown tour, if only for the food. There is a plethora of restaurants in this area, as it is with any other Chinatown in the world, and you are in for a treat!
Now, if you are the adventurous kind, you do not have to go far for one. Just look at the side streets for street food vendors, and you will have an experience worthy of the show Bizarre Foods. Ask for balut (boiled fertilized duck egg) and isaw (grilled pig or chicken intestines). Don't worry, it is 100% safe!