**14. Conclusion**

We should imagine along with John Lennon (1971) "No need for greed or hunger – A brotherhood of Man" and allow a return to our meat and micronutrient sharing roots. The immediate need is for further study using real world data by measuring Nicotinamide/NAD/NNMT and tryptophan metabolism. Monitoring should happen widely in populations at risk of both deficiency and excess from cradle to grave and in those with a variety of established diseases or trauma or asymptomatic mutations. Interventional studies should provide firm evidence from better nutritional research that does not assume that meat in moderation is toxic to planetary or human health [150].
