“Eating a meal with protein, vegetables, and healthy fat before consuming candy reduces blood sugar spikes by up to 37%." (Instagram, @drmarkhyman, 31 Oct 2026. On-image text: "Before trick or treating tonight, start with a real meal. Protein. Vegetables. Healthy fat. It'll reduce blood sugar spikes by up to 37% - meaning less of a crash,…”

The post gives no citation. The "37%" figure corresponds almost exactly to a single published number. In the 2015 Diabetes Care pilot study, mean postmeal glucose levels were decreased by 28.6% (P = 0.001), 36.7% (P = 0.001), and 16.8% (P = 0.03) at 30, 60, and 120 min respectively, and the incremental area under the curve (iAUC0-120) was 73% lower when vegetables and protein were consumed first, before carbohydrate, compared with the reverse order. That study was conducted in 11 subjects (6 female, 5 male) with metformin-treated type 2 diabetes. The 36.7% is therefore a single-timepoint (60 minute) result from a crossover comparison of eating order within one meal, in eleven people with type 2 diabetes. It is not a measure of what a meal does to a separate candy-eating episode later in the evening. The broader direction of the claim has support. A 2025 systematic review concluded that adjusting the order of food consumption can effectively mitigate acute postprandial glucose responses in healthy individuals, while noting that most studies in this area are limited by small sample sizes, short intervention durations, and heterogeneity. A randomized crossover trial in healthy UAE adults found that the incremental area under the curve (iAUC0-120) for glucose following the vegetable-protein-fat meal sequence was 40.9% lower (p = 0.03) compared with the standard mixed meal, concluding that eating carbohydrates after vegetables and protein portions improved postprandial glycemic spikes, insulin secretion, and satiety in healthy individuals. In children, the only directly relevant work found is in type 1 diabetes: protein and fat consumed 15 minutes prior to carbohydrates reduced mean glucose levels by roughly 10% in 20 children with type 1 diabetes, and consumption of protein and fat prior to carbohydrates results in lower postprandial glucose levels and reduced glycemic variability in that population. The closest published analogue to "eat a meal now, candy later" is the second-meal effect literature, which concerns a separate earlier intake rather than ordering within one sitting. One trial reported that consuming a high-protein prebreakfast snack results in almost 40% reduction of postprandial glucose increment in people with type 2 diabetes. On the behavioral claims attached to the post, the relevant synthesis points the other way. A JAMA meta-analysis concluded that sugar does not affect the behavior or cognitive performance of children and the strong belief of parents may be due to expectancy and common association. That conclusion was based on 23 studies, and at least one published correspondence argued for a more qualified interpretation.