The condensed version of the the studies and articles from that google search is quite simple.

One must first understand that a concussion is not a single moment event. It is a process. The impact throws the brain out of balance and it needs to regain that balance, chemically, fluid control, etc. That out of balance state feeds further degradation of brain function.

The latest research says the first 24 to 48 hours are critical for allowing the brain a chance to regain that balance by reducing other workloads on the brain. Low intensity activities help with stimulating a normal level of blood flow without any stress chemicals messing up the situation.

Pushing through in those first 24 to 48 hours leads to increasing the imbalance to points that can take a very prolonged time to recover.

Since every concussion is different, overcoming prolonged symptoms is unique to each individual. The basics are important. 1. Good quality sleep. 2. Low stress living. 3. Healthy eating with supplements to assist the brain. 4. Avoiding or limiting chemical stressors (alcohol, caffeine, etc) 5. Making sure you do not have physiological injuries that can be a problem (neck injuries that can cause reduced blood flow to the brain or cause muscles spasms)