The Food 

Sweetness in food
reduces the beer’s sweetness
enhances the beer’s sourness
enhances the beer’s bitterness

Sourness in food
reduces the beer’s sourness
reduces the beer’s bitterness
enchances the beer’s sweetness

Salt in food
reduces the beer’s sweetness
reduces the beer’s sourness
reduces the beer’s bitterness

Bitterness in food
reduces the beer’s sourness
reduces the impression of salt in the beer
enhances the beer’s sweetness
enhances the beer’s bitterness