It's excessive diets is incorrectly written and should be written as diets excessive being its meaning:
Of course that the query must have been for " diets excessive " not to say that they should first find " diet " and " excessive ". The phrase probably appeared in some news about the increase of the payment of the diet in some country where the same legislators approve their salaries and their travel expenses, and therefore the numbers end up being disproportionate with respect to wages in general. See: diet. See: Desmedido.
It's excessive diets is incorrectly written and should be written as "dieting is the amount of food provided to an organism in a 24-hour period," being its meaning:
A diet is the amount of food that is provided to an organism in a 24 hour period, regardless of whether or not it covers your maintenance needs, in short is the set of nutrients that are absorbed after the habitual consumption of food.