Years ago I would get swollen nodes which seemed to correspond to episodes of liver congestion and viral outbreaks...
Lymph-nodes are blood cleaners, if the liver is congested or not functioning optimally it places burdens on the other systems...too much protein in one sitting without balancing levels of Fat could overload the livers metabolic capacity, especially if the body isn't yet fully adapted. Its feasible that the protein overload aggravated by other factors could trigger lymphatic congestion.
There usually are a number of other factors that contribute to these issues. Chronic toxicity, auto immunity reactions and viral outbreaks may also lead to swollen lymph-nodes.
I would recommend making sure you get enough optimal quality fats, and organ meats. I personally eat all the organs, glands lymph nodes, spleen, bile, pancreas, thyroid, bloods, marrow, etc..and believe that