What factors could contribute to weight gain over a year?

Reviewed by Yoshinori Abe, MD

Internal Medicine

Unexplained weight gain over the course of a year can result from several factors, including poor self-control around food, chronic stress, and major life changes such as a new job, relationship shifts, or reduced physical activity. Hormonal imbalances, sleep issues, and underlying medical conditions may also play a role.

Because weight gain often has overlapping causes, identifying the root issue is the most important first step. A free, instant, online symptom check can help you pinpoint possible contributors, understand what your body may be signaling, and guide your next steps with clarity—whether that means lifestyle adjustments or a conversation with your doctor.

Reviewed for medical accuracy: 07/20/2026

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Explanation

Weight gain can happen for many reasons. One important factor is self-control. If people have a hard time controlling what they eat, they might gain weight over time. This is because they might eat more than they need or choose foods that are not healthy.

Stress and life changes are also important. When people experience stress or go through big changes in their lives, it can affect their weight. Stress can make people eat more or choose unhealthy foods.

Finally, some people report big changes in their weight over a year. This can be because of how they handle stress or changes in their eating habits. If you're experiencing unexplained weight changes or other concerning symptoms, you can use a free symptom checker to better understand what might be happening with your health.

(References)

Nederkoorn C, Houben K, Hofmann W, Roefs A, & Jansen A. (2010). Control yourself or just eat what you like? Weight gain over .... Health psychology : official journal of the Division of Health Psychology, American Psychological Association, 20658826.
Fogelman N, Magin Z, Hart R, & Sinha R. (2022). A Longitudinal Study of Life Trauma, Chronic Stress and .... Behavioral medicine (Washington, D.C.), 32552603.
Meltzer AA, & Everhart JE. (1995). Self-reported substantial 1-year weight change among .... Obesity research, 8581768.

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