What foods thicken hair?

Good day! I've been hearing a lot about various foods that can help thicken hair. Could you please elaborate on what these foods are and how they work to promote thicker hair? Are there any specific nutrients or vitamins in these foods that contribute to this effect? Additionally, how long can one expect to see results if they incorporate these foods into their diet regularly? Lastly, are there any precautions or considerations one should be aware of when trying to thicken hair through dietary changes? Thank you in advance for your insights.