A study published a few days ago in the Lancet found that high carbohydrate intake was associated with higher risk of total mortality, fats including saturated and unsaturated fatty acids were associated with lower risk of total mortality and stroke. The authors note that current guidelines recommend a low fat diet (<30% of energy) and limiting saturated fatty acids to less than 10% of energy intake by replacing them with unsaturated fatty acids. These guidelines are based on findings from some North American and European countries where nutrition excess is of concern. However, these latest study findings are in contrast to dietary guidelines, where fats, including saturated fatty acids, are not harmful and diets high in carbohydrate have adverse effects on total mortality.
Dehghan M et al. Prospective Urban Rural Epidemiology (PURE) study investigators. Associations of fats and carbohydrate intake with cardiovascular disease and mortality in 18 countries from five continents (PURE): a prospective cohort study. Lancet. 2017 Aug 28. pii: S0140-6736(17)32252-3.