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Protein consumption in Canadian habitual diets: Usual intake, inadequacy, and the contribution of animal- and plant-based foods to nutrient intakes.

The 2019 Canada's Food Guide (CFG) emphasizes consumption of plant protein with implications for protein adequacy and nutrient intakes, yet a baseline with which to compare future dietary trends that may result from its adoption is not available. The objectives were to assess usual protein intake, inadequacy, and the contribution of animal- and plant-based foods to intake of protein and nutrients in Canada. 24-hour dietary recalls from the 2015 Canadian Community Health Survey - Nutrition were used to assess dietary intake among adults (n = 13 616). The National Cancer Institute method was used to estimate usual protein intake and inadequacy. Population ratios were used to determine the contribution of animal- and plant-based foods to intake of protein, nutrients, and energy. Usual protein intake averaged 79.47±0.70 g/d; inadequacy was highest for females ≥71y (9.76±2.04%). Top protein contributors were red and processed meat (21.6±0.55%), poultry and eggs (20.1±0.81%), cereals, grains, and breads (19.5±0.31%), and dairy (16.7±0.38%). Dairy contributed most to calcium (53.4±0.61%), vitamin D (38.7±1.01%), but also saturated fat (40.6±0.69%), whereas cereals, grains, and breads contributed most to iron (46.5±0.57%) and vegetables and fruit to potassium (32±0.45%). Given that animal sources contributed overwhelmingly to protein intake in 2015, dietary shifts towards plant protein needed to meet the 2019 CFG recommendations may pose a challenge, particularly for populations most at risk of inadequacy. Novelty: • Older adults and females are most at risk of not meeting protein recommendations. • Animal sources contribute two-thirds of the protein consumed by Canadian adults.