IL17A and atrial fibrillation: To determine if the HFD AF could expand ILC3, we gavaged neonatal GF mice, and maintained them as germ-free using a strictly controlled germ-free isolator facility, with AF from conventional RD and HFD dams (Figure 5A), or PBS, for 10 days and found that at 2-weeks-old the HFD AF gavaged pups had an expansion of ILC3 and IL17+ve ILC3 (Figure 5B), demonstrating that the mHFD AF was sufficient to expand IL17+ve ILC3 in neonatal pups.