Plasma lathosterol measures rates of cholesterol synthesis and efficiency of dietary phytosterols in reducing the plasma cholesterol concentration Valéria Sutti Nunes; Angela de Oliveira Godoy Ilha; Guilherme da Silva Ferreira; Renata de Paula Assis Bombo; Milessa Silva Afonso; Maria Silvia Ferrari Lavrador; Roberta Marcondes Machado; Edna Regina Nakandakare; Eder Carlos Rocha Quintão; Ana Maria Lottenberg;