Food Passaging Assay
Food Passaging Assay - Related Videos
06:13
Measuring Crop Motility and Food Passaging in Drosophila
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Cited by 1 •
2020
The goal of this protocol is to measure crop contraction and quantify food distribution in the Drosophila gut.
10:02
Passaging Cells
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2023
Cell lines are frequently used in biomedical experiments, as they allow rapid culture and expansion of cell types for experimental analysis. Cell lines are cultured under similar conditions when compared to freshly-isolated, or primary, cells, but with some basic important differences: (i) cell lines require their own specific growth factor cocktails and (ii) their growth must be more closely monitored than primary cells, as the mutations that allow them to be grown indefinitely also can...
07:42
The CApillary FEeder Assay Measures Food Intake in Drosophila melanogaster
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Cited by 92 •
2017
The CApillary FEeder (CAFE) assay is a simple, budget-friendly, highly reliable method for investigating mechanisms underlying food intake. Used with the highly versatile genetic model organism Drosophila melanogaster, it provides a powerful means of gaining new insights into regulatory mechanisms of food intake.
04:18
The CApillary FEeder (CAFE) Assay: A Method to Track Food Consumption and Preference in Drosophila
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2023
This video describes the CApillary FEeder, or CAFE, assay, a behavioral method that measures food intake and preference of unrestrained fruit flies. The featured protocol shows how to perform the assay with minimal evaporation from the liquid-filled capillaries used to deliver the food and track its intake.
07:13
A Rapid Food-Preference Assay in Drosophila
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Cited by 8 •
2021
We present a protocol for a two-choice feeding assay for flies. This feeding assay is fast and easy to run and is suitable not only for small-scale laboratory research, but also for high-throughput behavioral screens in flies.
FAQs
Tracer choice determines what researchers can follow during the assay. A visible or fluorescent label makes the consumed food distinguishable from surrounding biological material, allowing movement, retention, or elimination to be tracked over time. Comparing these measurements under the same defined conditions helps separate altered gastrointestinal performance from differences in the material used for measurement.
Defined conditions make measurements comparable across organisms or experimental groups. If food transit changes after a genetic difference, drug exposure, environmental stress, or microbial interaction, researchers can interpret the tracer pattern against a controlled baseline. This design helps attribute differences in gastrointestinal performance to the factor being studied rather than to unspecified changes in the assay setting.
Movement, retention, and elimination provide complementary views of digestive performance. Movement indicates progression through the tract, retention shows that marked food remains within it, and elimination indicates that material has exited. Examining these patterns over time can help identify changes associated with gut motility, digestion, nutrient processing, or broader intestinal function, rather than relying on a single endpoint.
A typical workflow begins by allowing organisms to consume food containing a visible or fluorescent tracer. Researchers then maintain the organisms under defined conditions and monitor the marked material as time passes. They record its movement, retention, or elimination and compare those observations between relevant conditions. This sequence converts food transit into a measurable functional readout of gastrointestinal performance.
Researchers can apply the assay to test effects linked to genetic factors, drugs, environmental stress, or microbial interactions. Each comparison asks whether the tracer behaves differently under the factor of interest, such as altered retention or elimination. Because the assay measures feeding and gastrointestinal performance functionally, it can connect an experimental condition with changes in digestive tract behavior.
In biology, the method is especially useful when researchers need to relate food transit to gastrointestinal physiology or host-microbe relationships. It can also support studies of disorders that alter nutrient processing or intestinal function. The resulting time-dependent measurements provide a way to compare normal and altered conditions and to evaluate whether the digestive tract shows a changed functional response.