It is a bit frustrating to apply makeup onto your lips only to find that it smears within just a few bites. It may not be something you can avoid all the time, but there are some little tricks that can help your color to be fixed a bit longer. The positive thing is that it does not need to seem difficult or time-consuming to make your lipstick look fresh even after meals. A couple of considerate moves and some practice can make it easier to appreciate your food without scrutinizing yourself all the time.
Start with smooth, prepped lips

Lipstick can be more easily applied to a smooth surface, and a slight preparation of the lips can help. A diffusion of light and then a rehydrating balm could serve to provide a smooth surface on which color can cling better.
Apply a thin first layer and build gradually

Rather than going with a heavy coat immediately, a thin coat might be better to stay put. Building up the color gradually can help it stick more uniformly and potentially lessen initial fading during consumption.
Use a lip liner to create a strong base

Applying a liner over the lips prior to lipstick could possibly provide the color with something to cling to. It might also serve in demarcating edges, which would prevent any fading that was made less pronounced and obvious during the day.
Blot between layers for better hold

Blotting of your lips with a piece of tissue after the initial application can remove excess product. An additional coating can then be applied to allow the pigment to settle in a more permanent manner during meals.
Set your lipstick with a touch of powder

To help fix the color, a small sample of translucent powder pressed lightly over a tissue on your lips may help. This may seem like an easy task, but it can occasionally create a visible change.
Use a straw when possible

Using a straw could cause less direct contact with your lips when drinking drinks. This slight movement may save your lipstick, particularly when you are attempting to look presentable at a dinner table.
Carry a compact mirror for quick checks

It may fade for some, even with optimum preparation. The presence of a mirror may help pick up the tiny touch-ups at an early stage, when the lipstick is not yet worn out of shape.
Layer with a lip stain for extra support

A lip stain under lipstick may provide a faint shade that will not fade away as the top color dies off. It would result in a less abrupt loss of color and a softer transition.
Pick foods that are less messy when possible

Some foods can be more naturally smudged than others. It may not be something that you can always control, but maybe just using less messy ones could help your lipstick last longer.