24 years old and doing this for my kid

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I'm 24 years old with a six month old son. I can already see him with horrable eating habits based just on my eating habits. I don't want that I have a bad sweet tooth and have unhappy with my weight for years. i want him to start off life with good habits. So I decided its time for me to make a change. I want to be able to keep up with him and have the energy to hike and bike ride with him in years to come. anyone else doing this for their kids?