A Christian woman is asking whether there are any methods for weight loss in Islam

First of all
we would like to thank you for contacting our website, and we hope that
Allah, may He be exalted, will enable us and you to do that which He loves
and which pleases Him, and that He will guide all of us to His straight
path. 

Part of the
greatness of the blessing in the religion of Islam is that it has not
omitted anything good that people need but it has enjoined it and pointed it
out, and it has not omitted anything evil of the affairs of this world and
the hereafter, but it has warned against it and forbidden it. Hence it is
complete and perfect in all aspects. 

With regard to
this matter, Islam teaches some protective measures, the most important of
which is moderation in eating and the prohibition on extravagance therein. 

Allah, may He
be exalted, says (interpretation of the meaning):

“and
eat and drink but waste not by extravagance, certainly He (Allah) likes not
Al-Musrifoon (those who waste by extravagance)”

[al-A ‘raaf
7:31]. 

It was
narrated that Miqdaam ibn Ma‘di Karib said: I heard the Messenger of Allah
(blessings and peace of Allah be upon him) say: “The son of Adam does not
fill any vessel worse than his stomach. It is sufficient for the son of Adam
to eat a few mouthfuls to keep him standing upright. But if he must (fill
it), then one third for his food, one third for his drink, and one third for
his breathing.”

Narrated by
at-Tirmidhi, 2380; classed as saheeh by al-Albaani in as-Silsilah
as-Saheehah, 2265 

Some of the
salaf (early generations of Muslims) said:  Allah summed up all of medicine
in half a verse (interpretation of the meaning): “and
eat and drink but waste not by extravagance”
[al-A ‘raaf 7:31].

End quote from
Tafseer Ibn Katheer, 3/406 

Ibn al-Qayyim
(may Allah have mercy on him) said, concerning what we learn from the verse
quoted above: 

Here Allah
commands His slaves to consume food and drink that will maintain  the body
and replenish energy, and tells them that it should be of sufficient
quantity and quality to benefit the body; if it goes beyond that, then it is
extravagance, and both are detrimental to health and cause disease – I mean
not eating and drinking, or being extravagant in that regard. Maintaining
good health is all summed up in these few divine words.

End quote from
Zaad al-Ma‘aad, 4/195 

For more
information, please see the answer to question no.
102374

Obesity may be
due to genetic factors or some kind of disease, or it may be due to hormonal
imbalance in the body. But it may – as is the case for many people –be due
to eating too much and moving too little. The way to treat that is to
consult medical specialists, because our religion instructs us to consult
specialists in every field and to benefit from them so long as it does not
go against Islamic teachings, because Allah, may He be exalted, says
(interpretation of the meaning): “So
ask of people of knowledge, if you know not.”
[an-Nahl 16:43]. 

For more
information, please see the answer to question no. 14325 

We wish to
invite you to something that is more important than all of that, which is to
look for the path of your salvation and accept the final religion of Allah,
which was foretold by all of the Prophets before our Prophet Muhammad
(blessings and peace of Allah be upon him), the last of whom before him was
the slave and Messenger of Allah, and His Word, namely ‘Eesa ibn Maryam
(Jesus son of Mary); he foretold the coming of our Prophet (blessings and
peace of Allah be upon him). Allah, may He be exalted, says (interpretation
of the meaning):

“And (remember) when ‘Eesa (Jesus), son of Maryam (Mary), said: ‘O Children
of Israel! I am the Messenger of Allah unto you confirming the Taurat
((Torah) which came) before me, and giving glad tidings of a Messenger to
come after me, whose name shall be Ahmad.’ But when he (Ahmed i.e. Muhammad
SAW) came to them with clear proofs, they said: ‘This is plain magic.’

And who does more wrong than the one who invents a lie against Allah, while
he is being invited to Islam? And Allah guides not the people who are
Zalimoon (polytheists, wrong-doers and disbelievers) folk.

They intend to put out the Light of Allah (i.e. the religion of Islam, this
Quran, and Prophet Muhammad SAW) with their mouths. But Allah will complete
His Light even though the disbelievers hate (it).

He it is Who has sent His Messenger (Muhammad SAW) with guidance and the
religion of truth (Islamic Monotheism) to make it victorious over all
(other) religions even though the Mushrikoon (polytheists, pagans,
idolaters, and disbelievers in the Oneness of Allah and in His Messenger
Muhammed SAW) hate (it)”
[as-Saff 61:6-9].

For more information, please see
the answers to questions no. 12628,
82361 and 148661 

And Allah knows best.