That sounds good. Just a bit of a binge... since you are on Lantus.

The grapefruit has been shown to increase insulin actions. Only use unsweetened 100% juice. (or a half grapefruit fresh)
You cannot use the grapefruit if you are using RX drugs.
This is a list of drugs that interact with grapefruit:
http://en.wikipedia.org/wiki/List_of..._by_grapefruit
Remember new drugs may not appear on this list yet.
Always check with your pharmacist if in doubt.

http://www.liebertonline.com/doi/abs.../jmf.2006.9.49

And remember, to move those large muscle groups during the binge time + grapefruit... the excess sugar is supposed to go to your muscles and not your stored fat. (in the videos).
(I go up and down our stairs). The thyroid receptors are also in your muscles.

Test your blood sugar before bedtime to see where you are.
And the next morning. After that you will know if you need a few more units of Lantus on the binge day.

Since you do not need daily short acting insulin with meals, you should show little effect, I am predicting.

Other diabetics with less control would need more supervision and perhaps not do the "binge" day.

You might be able to then lose that last weight. No guarantees tho...but it is worth a try.