Do you agree with the trainer who said weight loss is 90% diet and 10% exercise?

I’m not sure I agree with those percentages. I have worked on my diet all year and only lost 15 pounds. I do look different, having to abandon a lot of old clothes cause they are too big for me now but my weight has not changed that much.

Do you agree with the trainer who said weight loss is 90% diet and 10% exercise?
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