Definately eat! Once in labour you might not feel like it and you need the energy.

I was induced for both my DDs, I just needed one dose of gel for DD2 cause that put me into full blown labour within 5 hours of having it, but with DD1 I had everything, gelx2, synto, and rupturing membranes. The difference being I think, DD1 I was induced early with an unfavourable cervix, DD2 I was post-dates with a much more favourable cervix.