Analysis and regulation of food intake

Apparatus comprising:

• one or more antral sensors, configured to be applied to an antrum of the subject, and to generate an antral signal;
• and
• a control unit, configured to:
• detect ingestion of food by the subject,
• determine antral impedance responsively to the antral signal, and
• interpret a change in antral impedance vs. a baseline value of less than a threshold value as indicating that the ingested food is predominantly solid.

Apparatus comprising:

• one or more fundic sensors, configured to be applied to a fundus of the subject, and to generate a fundic signal;
• and
• a control unit, configured to:
• detect ingestion of food by the subject,
• determine fundic impedance responsively to the fundic signal,
• calculate a duration of a period during which the fundic impedance rose during the ingestion, and
• determine that the ingested food is predominantly solid upon finding that the duration of the period is greater than a threshold value.

Apparatus comprising:

• one or more antral sensors, configured to be applied to an antral of the subject, and to generate an antral signal;
• and
• a control unit, configured to:
• detect ingestion of food by the subject,
• calculate an antral local sense rate responsively to the antral signal, and
• determine that the ingested food is predominantly liquid upon finding that a reduction in the rate over a period of time is greater than a first threshold value, the period of time commencing during the ingestion of the food and having a period duration of less than a second threshold value.

Apparatus comprising:

• one or more fundic sensors, configured to be applied to a fundus of a subject, and to generate a fundic signal;
• and
• a control unit, configured to:
• make a determination of ingestion of food by the subject,
• determine fundic impedance responsively to the fundic signal,
• calculate a maximum rise rate, expressible as a measure of resistance over a measure of time, in the fundic impedance during at least one period of the ingestion, and
• determine that the ingested food is liquid upon finding that the rise is at least equal to a fundic rise threshold value.

A method comprising:

• detecting ingestion of food by a subject;
• determining antral impedance of an antrum of the subject;
• and
• interpreting a change in antral impedance vs. a baseline value of less than a threshold value as indicating that the ingested food is predominantly solid.

A method comprising:

• detecting ingestion of food by a subject;
• determining fundic impedance of a fundus of the subject;
• calculating a duration of a period during which the fundic impedance rose during the ingestion;
• and
• determining that the ingested food is predominantly solid upon finding that the duration of the period is greater than a threshold value.

A method comprising:

• detecting ingestion of food by a subject;
• calculating an antral local sense rate of an antrum of the subject;
• and
• determining that the ingested food is predominantly liquid upon finding that a reduction in the rate over a period of time is greater than a first threshold value, the period of time commencing during the ingestion of the food and having a period duration of less than a second threshold value.

A method comprising:

• making a determination of ingestion of food by a subject;
• determining fundic impedance of a fundus of the subject;
• calculating a maximum rise rate, expressible as a measure of resistance over a measure of time, in the fundic impedance during at least one period of the ingestion;
• and
• determining that the ingested food is liquid upon finding that the rise is at least equal to a fundic rise threshold value.