Questions & Answers about A comida é suficiente.
Because a is the feminine singular definite article, meaning the.
In Portuguese, it is very common to use a definite article where English might use no article at all. So a comida can mean:
- the food
- sometimes food in a general/contextual sense, depending on the situation
Here, a comida most naturally means the food.
Since comida is a feminine noun, the article is a, not o.
- a comida = the food
- o alimento = the food / the nourishment