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From_II 1986_MC to_II 1990_MC the_AT composition_NN1 of_IO people_NN 's_GE diets_NN2 has_VHZ changed_VVN ._. 
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In_II 1986_MC the_AT amount_NN1 of_IO grain_NN1 ,_, fruit_NN ,_, and_CC vegetables_NN2 was_VBDZ higher_JJR while_CS the_AT meat_NN1 and_CC dairy_NN1 consumption_NN1 was_VBDZ lower_JJR ._. 
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<s>
The_AT next_MD four_MC years_NNT2 ,_, however_RR ,_, shows_VVZ an_AT1 increase_NN1 in_II the_AT amount_NN1 of_IO dairy_NN1 and_CC meat_NN1 consumed_VVN and_CC a_AT1 decrease_NN1 in_II the_AT amount_NN1 grain_NN1 ,_, fruit_NN ,_, and_CC vegetables_NN2 ._. 
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<s>
There_EX are_VBR several_DA2 possible_JJ explanations_NN2 for_IF these_DD2 changes_NN2 ._. 
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One_PN1 is_VBZ that_CST the_AT supply_NN1 of_IO grain_NN1 ,_, fruit_NN ,_, and_CC vegetables_NN2 has_VHZ decreased_VVN while_CS the_AT supply_NN1 of_IO meat_NN1 and_CC milk_NN1 has_VHZ increased_VVN ._. 
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<s>
Obviously_RR if_CS milk_NN1 and_CC meat_NN1 are_VBR more_RGR readily_RR available_JJ than_CSN other_JJ food_NN1 ,_, then_RT it_PPH1 would_VM be_VBI cheaper_JJR and_CC more_RGR economical_JJ to_TO consume_VVI more_DAR of_IO it_PPH1 ._. 
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Another_DD1 explanation_NN1 is_VBZ that_CST people_NN 's_GE incomes_NN2 have_VH0 increased_VVN over_II the_AT last_MD five_MC years_NNT2 ._. 
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<s>
Grain_NN1 ,_, fruit_NN ,_, and_CC vegetables_NN2 are_VBR typically_RR cheaper_JJR in_II price_NN1 than_CSN milk_NN1 and_CC meat_NN1 so_RR if_CS income_NN1 is_VBZ low_RR then_RT more_DAR of_IO the_AT inexpensive_JJ food_NN1 is_VBZ consumed_VVN ._. 
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<s>
With_IW people_NN earning_VVG more_DAR money_NN1 they_PPHS2 can_VM afford_VVI to_TO consume_VVI more_DAR milk_NN1 and_CC meat_NN1 than_CSN they_PPHS2 could_VM previously_RR ._. 
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<s>
I_PPIS1 feel_VV0 that_CST the_AT reason_NN1 for_IF the_AT dietary_JJ changes_NN2 over_II the_AT last_MD few_DA2 years_NNT2 is_VBZ that_CST people_NN 's_GE standard_NN1 of_IO living_NN1 has_VHZ increased_VVN ._. 
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<s>
People_NN now_RT have_VH0 more_RGR disposable_JJ income_NN1 ,_, which_DDQ allows_VVZ them_PPHO2 to_TO spend_VVI the_AT extra_JJ money_NN1 on_II more_RGR expensive_JJ food_NN1 such_II21 as_II22 milk_NN1 and_CC meat_NN1 ._. 
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