A parametric analysis of the relationship between food quantity and rumination.

Three adults with profound intellectual disability lived in a state hospital. All had ruminate after every meal for years.

The team used a changing-criterion design. They varied the lunch size while keeping everything else the same. Meals jumped from 4 oz to 14 oz, then back down, then up again across days.

Rumination stopped within minutes when the plate held 14 oz. It returned the same day when the portion dropped back to 4 oz.

Changes were immediate and large. No extra prompts, toys, or staff time were needed—just more food.

Loukus (2015) and Barrett et al. (1987) both list food satiation as a top, evidence-based treatment for rumination. The 1984 data give the numbers behind that claim.

Robertson et al. (2013) extends the idea. They showed that non-stop access to a preferred snack after meals also cuts rumination. Together the papers say both bigger meals and extra post-meal bites work.

Saini et al. (2015) used the same parametric single-case style but on stereotypy. Both studies prove you can fine-tune simple variables—food amount or prompt number—to see clear behavior change.

If a client ruminates, try adding 10 oz to the meal before you try toys or restraints. Track the behavior across lunch sizes for one week. You may solve the problem with a kitchen scale, not a treatment plan.