According to multiple sources, the healthiest dark chocolate contains a cocoa percentage of 70% or higher. Dark chocolate with higher percentages of cacao solids typically contains less sugar but more fat. It is also high in calories and can contribute to weight gain if eaten in excess. However, chocolate, like nuts, can induce satiety, so the longer-term implications for weight control are not clear. Dark chocolate is also moderate in saturated fat, which can negatively affect blood lipid levels, though its heart-protective effects from flavanols appear to outweigh the risk. The studies in these sources generally used 20-30 grams of dark chocolate per day. Therefore, choosing dark chocolate with at least 70% cocoa and eating modest quantities may offer the greatest health benefits.