When you age meat, you increase the histamine levels present in the food. The vast majority of meat that is found at grocery stores, farmer’s markets, and even local ranches, is aged. When the immune and digestive system are in good condition, histamines usually are not a problem, but if you are sick there is a high probability your body is going to have difficulty detoxifying histamines. Histamines can lead to symptoms such as headaches or migraines, nasal congestion or sinus issues, hives, digestive issues, irregular menstrual cycle, fatigue, nausea, and vomiting. You do not need to eat unaged meat to begin your healing journey, but if you are sensitive to histamines it may slow down your recovery and if progress halts later down the road, this should be one of the first things you address. If you have loose stool for more than the first month on the diet, make sure to try unaged meat to see if that’s easier on your digestion.
The unaged company that I use is BetterFed. White Oaks also has unaged that I can tolerate but BetterFed tastes better (less nutty and they also sell sausages which are insanely good). You can use LIONDIET as a code and get 15% off your first order (that’s an affiliate code so I get money too) but I’m not lying when I say it tastes the best. If you’re sensitive to everything, don’t get the smoked sausages get the regular ones. That’s the meat I eat! BetterFed has unaged meat, White Oak Pastures has unaged grass fed meat, Billy Doe claims to have unaged meat but I get histamine reactions from them so be aware of that. A list of places to get unaged meat:
BetterFed Beef
White Oak Pastures
Bisra Meats
Northstar Bison
Green Pasture Farms (UK)
Pheasants Hill Farm (UK)
US Wellness Meats  (No beef)
For more info on histamines go here