Tipping Points

What is the point at which normal eating is overbalanced by exercise?
I am up to 5-6 times a week of one hour slow jogging. On forest trails mainly.
I have read that 1000 calories= one mile & that 30 miles a week is the tipping point.

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I many years ago typically ran 45 miles a week (marathon training).
no problem keeping the weight down.

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I guess with change in base line, new lesson must be learned.
Variables I can control are:

• speed
• time
• difficulty