Jupiter is the planet that guides us to the truth of our own existence. He is the ancient ruler of Pisces and the modern ruler of Sagittarius.
Sagittarius is about the great beyond. Going further and farther to find satisfaction. Jupiter is what the ancients referred to as a "benefic". He holds the properties of blessings and adoration. He rules religious leaders, professors, those in positions of authority who bring us love, safety and warmth through their rulership/ authority. Jupiter expands our consciousness. He brings us to a place of healing and prosperity.
If Jupiter is in the 6th house or squared by certain planets, or retrograde in the natal chart, there can be a feeling of being unable to expand. As if there is a glass ceiling you cannot get past.
It can show where there was someone in the family line who held that position of authority and abused it. Now, in this lifetime a scenario of being unable to receive the blessings of the universe is in play.
Jupiter transits can also lead to weight gain. Because he expands our consciousness, we can read his energy as a "go" for appetite increase as well.
Healing issues with our Jupiter only requires forgiveness for what has transpired that caused our beliefs of unworthiness.