Not only by diet, we make spermidine endogenously. https://www.researchgate.net/profile/Wesley-Brooks-2/publication/236190334/figure/fig1/AS:216426834075653@14

Not only by diet, we make spermidine endogenously. https://www.researchgate.net/profile/Wesley-Brooks-2/publication/236190334/figure/fig1/AS:216426834075653@1428611586549/The-polyamine-pathway-A-Polyamines-at-physiological-pH-Putrescine-2-8A.png https://www.researchgate.net/profile/Wesley-Brooks-2/publica... B6 will increase ODC and AMD1 activity. B2 for SMOX and PAO. This will keep this pathyway functioning well.