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Scientists_NN2 are_VBR constantly_RR saying_VVG that_CST levels_NN2 of_IO obesity_NN1 are_VBR increasing_VVG ._. 
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What_DDQ is_VBZ the_AT reason_NN1 for_IF this_DD1 increase_NN1 ?_? 
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Obesity_NN1 is_VBZ increasing_JJ because_CS the_AT amount_NN1 of_IO energy_NN1 individuals_NN2 consume_VV0 ,_, from_II the_AT food_NN1 they_PPHS2 eat_VV0 ,_, is_VBZ higher_JJR than_CSN the_AT amount_NN1 they_PPHS2 use_VV0 up_RP in_II the_AT daily_JJ activities_NN2 they_PPHS2 perform_VV0 ._. 
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Body_NN1 weight_NN1 is_VBZ maintained_VVN by_II a_AT1 simple_JJ energy_NN1 balance_NN1 between_II the_AT amount_NN1 of_IO energy_NN1 consumed_VVN and_CC the_AT amount_NN1 of_IO energy_NN1 expended_VVD ._. 
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The_AT national_JJ food_NN1 survey_NN1 has_VHZ identified_VVN that_CST over_II the_AT last_MD 25_MC years_NNT2 the_AT amount_NN1 of_IO food_NN1 we_PPIS2 consume_VV0 has_VHZ decreased_VVN ._. 
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This_DD1 implies_VVZ that_CST the_AT levels_NN2 of_IO obesity_NN1 are_VBR increasing_VVG because_CS the_AT amount_NN1 of_IO physical_JJ activity_NN1 performed_VVN is_VBZ declining_VVG ._. 
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There_EX is_VBZ also_RR inconclusive_JJ evidence_NN1 to_TO suggest_VVI that_CST a_AT1 high_JJ fat_NN1 ,_, low_JJ carbohydrate_NN1 diet_NN1 favours_VVZ the_AT development_NN1 of_IO obesity_NN1 ._. 
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Over_II the_AT past_JJ 5_MC decades_NNT2 the_AT proportion_NN1 of_IO energy_NN1 that_CST is_VBZ derived_VVN from_II fat_NN1 has_VHZ increased_VVN ,_, while_CS the_AT proportion_NN1 of_IO carbohydrates_NN2 has_VHZ decreased_VVN ._. 
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Fat_NN1 has_VHZ a_AT1 lower_JJR priority_NN1 to_TO be_VBI utilised_VVN for_IF energy_NN1 expenditure_NN1 than_CSN carbohydrate_NN1 and_CC is_VBZ more_RGR likely_JJ to_TO be_VBI stored_VVN than_CSN 'burnt_VV0 off_RP ._. '_" 
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Where_RRQ does_VDZ the_AT UK_NP1 stand_VVI in_II the_AT obesity_NN1 league_NN1 compared_VVN with_IW the_AT rest_NN1 of_IO the_AT world_NN1 ?_? 
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On_II a_AT1 global_JJ scale_NN1 more_RRR than_CSN 1_MC1 billion_NNO people_NN are_VBR overweight_JJ ,_, 300_MC million_NNO of_IO which_DDQ are_VBR obese_JJ ._. 
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Currently_RR the_AT highest_JJT levels_NN2 of_IO obesity_NN1 exist_VV0 in_II the_AT USA_NP1 where_CS it_PPH1 affects_VVZ 30.6%_FO of_IO the_AT population_NN1 ._. 
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In_II comparison_NN1 ,_, 22.4%_FO of_IO the_AT UK_NP1 's_GE population_NN1 is_VBZ reported_VVN to_TO be_VBI obese_JJ ._. 
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This_DD1 is_VBZ the_AT third_MD highest_JJT level_NN1 in_II the_AT world_NN1 below_II the_AT USA_NP1 and_CC Mexico_NP1 ,_, and_CC is_VBZ shortly_RR followed_VVN by_II Australia_NP1 ._. 
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Is_VBZ it_PPH1 true_JJ that_CST obese_JJ people_NN have_VH0 a_AT1 lower_JJR metabolic_JJ rate_NN1 and_CC do_VD0 not_XX actually_RR eat_VVI more_DAR than_CSN those_DD2 of_IO normal_JJ weight_NN1 ?_? 
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It_PPH1 is_VBZ not_XX true_JJ to_TO say_VVI that_DD1 obese_JJ people_NN have_VH0 a_AT1 lower_JJR metabolic_JJ rate_NN1 ._. 
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In_II fact_NN1 ,_, because_CS obese_JJ people_NN have_VH0 more_DAR weight_NN1 to_TO bear_VVI ;_; their_APPGE energy_NN1 expenditure_NN1 will_VM be_VBI higher_JJR in_II carrying_VVG out_RP the_AT same_DA task_NN1 as_CSA a_AT1 lean_JJ person_NN1 ._. 
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Resting_VVG metabolic_JJ rate_NN1 is_VBZ greatly_RR determined_VVN by_II the_AT amount_NN1 of_IO muscle_NN1 and_CC fat_JJ tissue_NN1 ._. 
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The_AT higher_JJR stores_NN2 of_IO fat_NN1 that_CST obese_JJ people_NN have_VH0 will_NN1 lead_VVN to_II a_AT1 higher_JJR metabolic_JJ rate_NN1 ._. 
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The_AT research_NN1 that_CST was_VBDZ conducted_VVN into_II metabolic_JJ rate_NN1 and_CC possible_JJ defects_NN2 in_II this_DD1 being_VBG the_AT cause_NN1 of_IO obesity_NN1 were_VBDR abandoned_VVN ._. 
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This_DD1 is_VBZ because_CS it_PPH1 became_VVD clear_JJ obese_JJ people_NN frequently_RR under_II report_NN1 when_CS recording_VVG their_APPGE diets_NN2 ._. 
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In_II some_DD cases_NN2 obese_JJ people_NN may_VM not_XX eat_VVI much_DA1 more_DAR than_CSN those_DD2 of_IO normal_JJ weight_NN1 but_CCB their_APPGE extreme_JJ weight_NN1 gain_NN1 is_VBZ a_AT1 result_NN1 of_IO physical_JJ inactivity_NN1 ._. 
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Does_VDZ obesity_NN1 run_VVN in_II families_NN2 ?_? 
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<s>
The_AT levels_NN2 of_IO obesity_NN1 have_VH0 accelerated_VVN over_II a_AT1 relatively_RR constant_JJ gene_NN1 pool_NN1 which_DDQ makes_VVZ it_PPH1 apparent_JJ that_CST an_AT1 individual_NN1 's_GE genetic_JJ make-up_NN1 is_VBZ not_XX enough_RR to_TO be_VBI the_AT sole_JJ cause_NN1 of_IO obesity_NN1 ._. 
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There_EX is_VBZ evidence_NN1 to_TO suggest_VVI that_CST there_EX may_VM be_VBI a_AT1 susceptible_JJ gene_NN1 which_DDQ makes_VVZ some_DD individuals_NN2 more_RGR prone_JJ to_II the_AT risks_NN2 of_IO obesity_NN1 ._. 
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This_DD1 must_VM be_VBI combined_VVN with_IW adverse_JJ environmental_JJ conditions_NN2 ,_, such_II21 as_II22 poor_JJ dietary_JJ habits_NN2 and_CC lack_NN1 of_IO exercise_NN1 ,_, to_TO cause_VVI extreme_JJ weight_NN1 gain_NN1 ._. 
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As_CSA eating_VVG patterns_NN2 are_VBR habitual_JJ it_PPH1 is_VBZ more_RGR likely_JJ that_CST a_AT1 child_NN1 with_IW obese_JJ parents_NN2 will_VM develop_VVI obesity_NN1 ._. 
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Physical_JJ activity_NN1 is_VBZ often_RR blamed_VVN as_II a_AT1 factor_NN1 in_II obesity_NN1 ._. 
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How_RGQ much_DA1 activity_NN1 should_VM we_PPIS2 be_VBI doing_VDG and_CC does_VDZ exercise_VVI help_VV0 you_PPY to_TO lose_VVI weight_NN1 ?_? 
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<s>
It_PPH1 is_VBZ recommended_VVN that_CST every_AT1 adult_NN1 ,_, whether_CSW overweight_JJ or_CC not_XX ,_, should_VM take_VVI part_NN1 in_II thirty_MC minutes_NNT2 of_IO moderate_JJ intensity_NN1 physical_JJ activity_NN1 on_II at_RR21 least_RR22 five_MC days_NNT2 per_II week_NNT1 ._. 
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<s>
Physical_JJ activity_NN1 of_IO moderate_JJ intensity_NN1 is_VBZ equivalent_JJ to_II a_AT1 brisk_JJ walk_NN1 and_CC should_VM be_VBI enough_DD to_TO raise_VVI body_NN1 temperature_NN1 ,_, produce_VV0 a_AT1 mild_JJ sweat_NN1 ,_, but_CCB still_RR remain_VV0 comfortable_JJ ._. 
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<s>
Obese_JJ individuals_NN2 will_VM find_VVI it_PPH1 difficult_JJ to_TO reach_VVI this_DD1 target_NN1 so_CS it_PPH1 would_VM be_VBI sufficient_JJ to_TO begin_VVI with_IW a_AT1 shorter_JJR time_NNT1 period_NN1 and_CC build_VV0 it_PPH1 up_RP over_II several_DA2 weeks_NNT2 ._. 
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<s>
Physical_JJ activity_NN1 by_II itself_PPX1 will_VM result_VVI in_II moderate_JJ weight_NN1 loss_NN1 ._. 
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<s>
To_TO achieve_VVI the_AT greatest_JJT loss_NN1 in_II weight_NN1 it_PPH1 should_VM be_VBI accompanied_VVN by_II diet_NN1 restriction_NN1 ._. 
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