Neither prediction is doing very well (the blue and red curves). The yellow curve is a fit to the equation w(t) = aebt + 130, and I only fit the equation to the last two points, because I think the first measurement is inflated relative to my current diet. If I include the first point and leave the asymptote unknown, Mathematica chokes! I used 130 instead because that is the number from the red curve and it seem reasonable. More data will always help!

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