
A practical guide to turning a plain yogurt snack into a planned protein, fiber, and healthy-fat fuel window for steadier afternoon energy.

| Window | What to do | Why it protects focus |
|---|---|---|
| 1. First fuel | If coffee comes first, add a protein bite within the next hour. | Prevents caffeine from becoming the whole morning plan. |
| 2. Late morning | Use the yogurt anchor if breakfast was light. Add berries, chia, oats, or nuts. | Adds fiber and fat to the protein base before hunger gets loud. |
| 3. Lunch | Keep the same rule: protein + fiber-rich plants before or with starchier carbs. | Keeps lunch from being a fast-carb-only event. |
| 4. 2:30-3:30 p.m. | If the afternoon crash is predictable, eat the snack before the crash. | A pre-decided fuel window beats a vending-machine reaction. |
| 5. Late work block | Set a cutoff: fuel if dinner is more than two hours away, otherwise hydrate and leave. | Avoids turning end-of-day fatigue into random grazing. |

| Desk-ready combo | Protein | Fiber | Healthy fat |
|---|---|---|---|
| Plain Greek yogurt + berries + walnuts | Yogurt | Berries | Walnuts |
| Plain yogurt + chia packet + sliced apple | Yogurt | Chia and apple | Chia |
| Roasted chickpeas + almonds + apple | Chickpeas and almonds | Chickpeas and apple | Almonds |
| Tuna or salmon packet + whole-grain crackers + olive snack pack | Fish | Whole-grain crackers | Olives |

nutritionsource.hsph.harvard.edu
nutritionsource.hsph.harvard.edu
pmc.ncbi.nlm.nih.gov
pubmed.ncbi.nlm.nih.gov
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