When adults with excess weight reduce calories, those who eat more protein tend to get more essential vitamins and minerals like vitamin D, choline, and B vitamins, even though everyone’s nutrient intake drops overall during dieting.
Evidence from Studies
No evidence studies found yet.
What Would Prove This
Per GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this claim, ordered from strongest to weakest.
Whether increasing protein intake to 1.0 g/kg/day during caloric restriction consistently improves intake of key micronutrients (e.g., vitamins A, D, K, choline) compared to lower protein intakes.
A systematic review and meta-analysis of RCTs comparing protein intake of 1.0–1.2 g/kg/day versus 0.8 g/kg/day during weight loss, measuring daily micronutrient intake via validated food records and blood biomarkers for vitamins A, D, K, and choline.
Whether increasing protein intake to 1.0 g/kg/day directly causes improved micronutrient intake during caloric restriction, independent of food choices.
A double-blind RCT with 120 adults (BMI 25–40, aged 30–65) randomized to consume 1.0 g/kg/day protein (via controlled food delivery) or 0.8 g/kg/day protein, with identical counseling, measuring daily micronutrient intake via 7-day food records and serum biomarkers for vitamins A, D, K, and choline at baseline and 6 months.
Whether individuals who increase protein intake during weight loss also improve intake of key micronutrients over time, adjusting for confounders.
A prospective cohort study of 350 adults undergoing weight loss, measuring daily protein intake and micronutrient intake via monthly food records and serum biomarkers for vitamins A, D, K, and choline, adjusting for age, sex, and baseline nutrient status.
Whether higher protein intake correlates with better micronutrient intake at a single time point during weight loss.
A cross-sectional analysis of 500 adults in a weight loss program, comparing micronutrient intake and serum biomarkers between those consuming >75 g/day protein versus ≤60 g/day at the 6-month mark.
Whether individual cases of high protein intake coincide with improved micronutrient status during weight loss.
A case series of 10 individuals who increased protein intake to >80 g/day during weight loss and documented changes in micronutrient intake via food records and blood tests.