You'll only gain a ton of weight if you eat more than you burn in a day through living, breathing, shopping, cleaning, walking, working, and working out. And, you're not gonna blow up like a balloon gaining 50 pounds after a week or 2 of trying and seeing where they guidelines in the book take you. So, relax, you'll be fine, and there will be plenty of time to tweak and fix and make everything good before you become the goodyear blimp.
Give it time, look around here and see others who have also had your concerns, and see how they've managed and what they've done. Welcome. Enjoy your workout.
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