Gaining weight back

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I used to weigh 300 pounds and I got down to 210, I stayed that way for about eight years.

My mother passed away in June, I started gaining weight again since then, I’ve been watching what I eat, but I’m eating too much, I think.

Anybody willing to help me with me with some tips I would appreciate it as I’ve kept this way though for such a long time, I do not want to gain it back