Protein helps to build bones, muscle and skin. As we get older, we lose muscle mass and our bones get weaker so we need to increase our protein intake. The best sources of natural protein are from animal products (meat, eggs, fish) as they have all essential amino acids. Plant sources such as grains and green vegetables (e.g. broccoli) are good sources too but lack some amino acids so don't just rely on them. This is also why having a mixed and varied diet is key.