Been on the weight loss/gain roller coaster from surgeries with 16 since 2000 (3 back and 13 abdominal) My take is to come back slowly, eating very wisely. Your physician can guide you or refer you to a dietician that can guide you to safely re-entering riding. Best of luck and I hope this works out well for you.
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Semper Fi, USMC, 1975-1977
I Can Do All Things Through Him, Who Gives Me Strength. Philippians 4:13