Question: what did the original food guide pyramid fail to illustrate
[{'answer': 'the latest research on dietetics'}, {'provenance': [{'wikipedia_id': '208092', 'title': 'Food pyramid (nutrition)', 'start_paragraph_id': 30, 'start_character': 0, 'end_paragraph_id': 30, 'end_character': 267, 'bleu_score': 0.5705179409665291, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16380854283923779124}, 'section': 'Section::::USDA food pyramid.:Controversy.\n'}]}]