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"Gastos" is a form of "gasto", a noun which is often translated as "spending". "Dietas" is a form of "dietas", a plural noun which is often translated as "subsistence allowance". Learn more about the difference between "gastos" and "dietas" below.
el gasto(
gahs
-
toh
)A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).
a. spending
El gasto militar puede ser una carga para la economía.Military spending can be a burden for the economy.
las dietas(
dyeh
-
tahs
)A plural noun indicates that there is more than one person, place, thing, or idea.
a. subsistence allowance
Las dietas de los empleados incluyen hospedaje y comidas.The employees' subsistence allowance includes accommodation and meals.
b. per diem
Las dietas de los delegados solo incluyen transporte.The delegates' per diems only cover transportation.
la dieta
A feminine noun is almost always used with feminine articles and adjectives (e.g., la mujer bonita, la luna llena).
2. (food)
a. diet
La dieta diaria debe incluir muchas frutas y verduras.A daily diet should include lots of fruit and vegetables.
a. diet
Estoy a dieta para perder los diez kilos que me sobran.I'm on a diet to lose the ten extra kilos I'm carrying.
4. (politics)