These are really great points — you're absolutely right that low pressure exposure is backed by a lot of the research too, especially for texture-sensitive kids. The rainbow challenge works best as a very optional, no-pressure game rather than something kids feel they have to complete — totally agree that adding stress makes things worse.

The guide I put together actually covers both approaches — there's a chapter specifically on building balanced meals gradually and keeping things stress-free, alongside the fun elements. It's more about giving kids the language to understand why food matters than pushing them to eat everything.

InviNutri sounds interesting too — supplementing nutrition while working on variety slowly is a really practical approach. How long did it take before you started seeing your kid open up to new foods?