Meet the teacher who lost 100 pounds, then ran the Boston Marathon

Andy Bell appears live on "GMA" to share his inspirational health journey and how he changed his life around and became a finisher at one of the world's most exclusive marathons.
4:01 | 04/18/18

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Transcript for Meet the teacher who lost 100 pounds, then ran the Boston Marathon
O you to that incredible tranormation, high school teacher Andy shedding 100 pi that weight off even running theoston marathon on Monday. We're gog to tal tom live in just a moment. But first here's andy'ory. At 45, Andy bell I the fittest he's E been his life rug the bos'n marat just this week. I calhese praying mantis. Eporter: But six years ago he was 1oundsoverweight.suffering om high blood pressure and wor he wouldn' be around to see his daughters up. I couldn't believe that i39 and I had let myself gohat much. I had been anthte in high school and college and her I am 265 pounds anduldn't be taking medication for high blood pressure whems. He came up with a strategy tohealthy. Taking small steps. Removing O bad food from his diet at a ti. The first week he cut out fried od. The next week, soda. Sed the same strategy for ING out. Adds one minute to hisworkout every day until he worked his wa up to ten full nuts. I was surprised how hard I was breaafter 30 seconds and after O minute how much I was sweating a at T minutes GHT, this will probably kill me if anxiety doesn't. Repr: At his we've suggestion he started running D last five years Andy has drop 100 pounds running 12 marathons and becoming a mor present D as well. Yay for Andy. Registered dietitian Maya feller ishere. Now you want to meet Andy. Ianto meet Andy. Do Yo meetan all right. Andy, come O O here, and here he rs and applause ] Yay. T see Yo Good morning. So nic to see you. So proud of you. So wt was that moment in your life T you , know what, I've got to make a change?. W 39 and had to go in for the annual checkup and F time I stepped on the scale and seeing theumber 265 pous. I was already takingication for high blood pre and he said, you know, with the pattern or the track you're on you're on the fast trao becoming diabetic. Family history ofigh blood pressurend heart disease and LE there thinking how did I get T Thi pnt at 39? And I got Hom andalked wifend she sai one thing you cod to relieve your stress and me your goalould B T try running. She suggested doing a Ty thing -- W would W to run on Thanksgiving day? 'S footba ea sleep and repeat but she talked me into it and once that becamehe goal started training. I know but the way you did ne Thi at time. What can we learn from Andy's story. You know what I loveut Andy's story. It's exactly how I counsel. When my pnt comes I say I want to see your labs andan see the results from your physical assessment. When c,'m looking beyond thescale. It'sotust the numbers, how muou I'm looking atis diabetes, I'm looking at R fo hypertension and risk for art diseas this is exactly what a D. He said, I want to make Chan. I want to be there for my mily. I ink that's absolutely fantasti love how you did it in one step at a ti.this is what you used to have. That was my bigge - I lovedroot loops. So what I D not know -- I never measured out servings before so in starting today attention to what I was eating when I found out what one servof Froot loops was, it was pretty essing. T is what you eat and Maya -- moderation. It's absolutelyperfect. One of the things I lov AUT your style of eating is that it's based in whole and minimally processed food. He made small attainablenges consistent for his . It's gorg. You want to give a shoutout to my stent. Back at cedar C high Hool and my --S if.

This transcript has been automatically generated and may not be 100% accurate.

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